Good to see youve gone back to DP theboostshack
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After hurting a piston at 30psi I decided to do a little research and came across this
http://www.turbobuick.com/threads/al....378231/page-3.
It pretty much says with large amounts of meth ( and water in my case ) you need to tune the engine a little richer by the gas afr scale. I had my engine tuned at 11.3 when it hurt it and going by the plug that had the hurt piston it was lean, after putting it back together Ive settled with 10.5 to be safe and the plugs look happy.
You would think the water would cancel out the heat/lean issue but these are my findings, it may not be necessary for all engines but mine needs to be that rich not to hurt stuff. Cheers