im running a smaller impeller in my ride b/c. it does slip/cavitate under hard accelercation. but once i pop on plane it takes off and hauls the titties. my motor spins the high rpms. i sacrifice the low end holeshot for the faster top speed. i dont have a race boat so im not worried about holeshot but it gets the job done on top end.
maybe this is what he means or also a worn pump. i know i want to freshen mine up.
I also have a known tight pump, but due to engine torque, if I flat-foot it wide from idle, I cavitate the pump badly, regardless of who is in the boat. I run a largish impeller (full Aggressor B, equiv to a Berk A) and in my case it is simply the pump emptying before water can feed it with very little fwd. motion (which is the same thing W.O.T. is describing he has).
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