Nope, mine's an SP. I'm still working off the theory that shortening the piston skirt length increases intake duration, which means that the fuel has longer to enter the engine, which means that you should get more fuel into the engine to combust. I'm far far far far from an expert on how two stroke engines work, though, so maybe I'm off on that assumption. Also, there are going to be tradeoffs for anything you do, and I don't think it's a good idea to mess with something if you don't know what the tradeoff will be.
There are formulas you can work though (I think) that will probably tell you how much of a difference that intake duration makes, but (a) all that stuff is over my head, (b) I don't have a tool that I think could accurately measure the things that need to be measured, and (c) even if you did do all the math, you're still dealing with an itsy bitsy intake port and an intake manifold that's only 10 or 12mm or something.
I might be down for the "hack on our piston skirts" plan, but I'd need to look at it more closely before I started doing that. I also have it in about a million pieces right now, and I'm supposed to loan it out to a friend sometime sooner rather than later, so I'm in a bit of a time crunch to get it back working (faster or not) again.
The whole point of this is to make it go a little faster, right? I guess I'm too lazy to read back through all of this, so I'll just ask: what all have you already done to it, and how well did all that work? There are a lot of things that are easier and safer to change besides the length of the piston skirt.