WATER INJECTION ! cheaper & easier than replacing pistons.
http://www.aquamist.co.uk/cp/cp.html
Jim, I would definately make sure your air fule ratio and timing curve are "within spec",,,, then maybe do some reading up on water injection.
I have an aquamist system that I plan to put on Priest's turbo car as soon as it comes back from the body shop. (he is having an evo 2 body put on it this winter).
We got it from an outfit in Arizona for around 500 bucks.
Will be using the stock washer fluid tank since it has a low level light and will use 1/2 distilled water 1/2 methanol mixture.
What I like is the fact that the water injection fights detonation without needing to over richen the mixture & it helps keep the combustion chambers clean of carbon.
I'm not suggesting you use this as a bandaid to cover another problem, but it is great insurance & gives a little bit of "buffer" on any forced induction set up.
I don't think I'll add a turbo or supercharger to anything again without also installing a water injection system.
Remember that your "kompressor" has one disadvantage since it has a tendency to heat the air it compresses, so the water injection seems like a natural solution to fight that heat.
my 2 cents.
Good luck,
Alain