First of all, that’s about how fast I go, then, I get out in a lake, and do a 10-11 minute swim, in tri sprint. Well, there’s a few new fiends this year, fatter than me, all of which look like the second coming of “Wolfman,” so I’m about 3rd to last. Hope springs eternal.
So, you’re about an 8 minute or so plus, 500 yarder in a sprint, and, granted, you can’t translate the pool to the open water, without factoring in the Karate and Judo factor, scratching, kicking, grabbing, and utter freak out nature of getting back hammered, and beat down, in an open water swim, but still, not bad.
I’m guessing, if you did five or six 100 meter intervals, you would hold 1:40 - 1:50?
I think I can help you out, before WebSwim gets here to give you some solid information.
They will say, do drills, do intervals which descend. Shorten your rest!. Go faster, longer! Put yourself into as much discomfort in the water, as soon as possible, AS LONG AS POSSIBLE!
However, to get you over this gap, temporarily, sort of stop gap, what you want to do, is do that 500 meters again. Except this time, what you want to do is drink 4 red bulls about thirty minutes before, and take a shot of primatene mist, a bronchodialator.
Then hammer it hard.
See what happens.