it may be jacked up to high on the hull and it's runnin out of water at speed. a water pressure gauge would help.
you could strap the hull to the trailer and back it in the water and go at full throttle, keep her in deep see if she gets hot.
not sure what you are asking on first question, wiesco's are forged, they will grow about .004thou when they get to running temp. so when bored you need to add that .004 in, so the piston size and .008 to .010 thou is bore size, if you bore like stock pistons the wiescos will stick at runnin temp.
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