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Following up on my post regarding the trim limitations at or near WOT, I have the following:

Mechanic who did the 3 year service on the motor says that the engine's design includes a computer programmed trim limiter that kicks in at 3000 RPM (if I recall correctly). He reset that trim limiter on the engine to "factory specs", suggesting it was out of spec for some reason.

I won't know if the factory spec setting allows greater upward travel than the previous setting, but will certainly follow up here after hitting the water this spring and giving it some speed runs.

To summarize, the Mercury 150 HP Fourstroke has a trim limiter designed into the engine controls.