My swim coach has me switching things up more. I rotate thru the following workouts:

1. Long slow swim w/out stopping. Usually 3000 - 3500 yards. Sometimes longer.
2. 1500 yrd time trial at race pace.
3. 10x100 on 2:00 10x50 on 1:00. With warmup and cooldown of 500 yards or so each.
4. warmup/drills 700 yards. 2000 yards of stroke counting drills. For instance a 5x25 with the following stroke counts: 13 - 14 - 15 -16- 17. Then do 17 - 16 - 15 - 14 - 13. etc. 300 warmdown.
5. A few others similar to 4, above.
6. Coundown swim: 600, 500, 400, 300, 200, 100 with descending 100 split times.

I have put the workouts on little sheets of paper and then laminated them with sticky pages you can get at office max.

You seem to have the endurance base down pretty good, so I'd work on speed. In those intervals are you coming in on 1:30 for the 100's or are you leaving on the 1:30? Because you are not in the pool that much (9,000yds/week is not a lot) you need to make it a lot of fast workouts. Think of it like this: if you only spent 3 hours a week on the bike, would you be doing LSD rides or bust-your-ass intervals and speed sets. Hopefully the latter to get the most out of your time spent. Same with the swim. Spend about 75% of the time doing speedwork (100's, 200's, maybe even 50's) Ocassionaly do some longer sets (400,500) for pacing. Can you get another day in the pool? That would be pretty helpful to you.

You are definitely WAY faster than I. I find it easier to leave on the :30 or the :00, but if :35's work for you than do it. I think to really build more speed, do more than 5 repeats in a row. Work up to 10 or 20.

A workout I've been doing lately is 500w/u, 5x100 leaving on 2:00 coming in at 1:23-1:25, 5x100 leaving on 1:45 coming in at 1:23-1:25, 10x50 leaving on 1:00 coming in at :35-:40, 500c/d. That seems to cook my system pretty well.

If you are going 1:05 pace for 1000, that is a hell of a lot faster than a lot of people. That would proably be top 3 out of the water if not 1st in just about any race.

It seems like your swimming is solid, what do your bike and run splits look like?

That's not too bad. Your swimming is definitely better than your bike and run, but swimming's also the hardest to improve. I train at 17-18mph but race quite a bit faster than that. 23+ for OLY. Don't take your training speed too seriously. If you have a good base, than you could work on speed stuff.
My run pace in training is similar to yours, actually probably a bit slower than yours. But my race pace is about 6:50/mile for OLY.
I think adrenaline and a race setting have a lot to do with performance. I'm really competitive, so I push myself a lot to go fast.

Great Info

If you can come in on the 1:15 and your bike and run splits aren't so good, your time is probably better spent on the bike and run. I assume you come from a swimming background too? You sound like you are about my speed maybe a little faster. I just swim 1-4000 per week now. I quit swimming competitively after I graduated high school in 04 and now I swim about 2000 once every 1-2 weeks on average for the year. My race pace is about 1:15-1:20 now and I've been doing about 2000 2x/week for the past month. I supposed I could swim 15 hours per week like I used to and make it 1:05-1:10, but that would save me a grand total of 2.5 minutes for an olympic distance swim for 14 extra hours of swimming per week. Definitely not worth it. I'd just be an overtrained mess if I tried that especially with swimming and biking. Averaging about 12 hours of training per week with 11 of them biking and running, I can cut 10 min off the bike and 5 off the run, at least. My swimming hasn't slowed down THAT much and I'm just not worrying about it. Even if I did speed it up again, my splits probably wouldn't be that much faster because I'm pretty bad at sighting and I don't practice it so I swim off course all the time anyways.

I'm not saying I do it totally right, because I know I don't. Swimming 2-3x per week min is what you need to keep up a good feel for the water. It depends on what your personal goals are - if you want to win the swim at every race you do, go for it though. Otherwise, at least run or bike to your pool everytime you swim so you get some more training in those sports.

Take a look at the splits for your next race and look at the people that finished with similar times to you. There you will really see what you need to work on the most.

I usually do some or all of the master's workout that is still written on the whiteboard when I get to the pool. If its not there then I'll pick a workout out of http://www.swimmingworldmagazine.com/swim-cgi/ out of the mid-distance or distance freestyle workouts
or http://www.amazon.com/gp/product/1931382204/002-3807499-6166427?v=glance&n=283155 ... Sometimes I'll even do a breaststroke or im set that I remember from school for fun (except I can't make that 12x 200 im set on 2:45 anymore :-( ) I can't remember what the freestylers did in school, but now I wish I could.

What types of workouts are you doing for your bike and run? Adding some specificity to those workouts could/ will make a HUGE difference. What does one of your weeks look like, maybe last week? lay out what you did in each of your bike and run workouts and I'm sure there's something we can do to add some speed. Also, what distance races are you doing?

I'm fortunate enough to have swimming year around since I was 9 through college. I had my first sprint a few months ago. I will go ahead and tell you to only worry about swimming once a week for maybe an hour. I do a lot of technique drills and lots of 150s drillswimdrill.

Train a lot more on the bike and run. The swim goes by so fast to even worry about it. I treat the swim on raceday as a warmup for the bike and run. I nice easy 3:45 .