Rodney,

the engine that I sold to Troy is the fastest .12 I ever laid my hands on and a LOT of people came to me after the race I ran it in and asked me where they could get one.
This motor was faster than any modified .12 I have ever seen, maybe except Swauger's at Ft.Myers.

What makes you think it could be a dud?

No matter what the pro's opinions are here, the microcast piston seems to work very well in this particular set up and all the theory you are asking for won't change a thing.