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I've been using DoelFin hydrofoils on boats since 1984. In total I have about 60 boat years experience. My only caveat is that I have no experience with the other re-engineered designs.

That said, my Whaler Montauk has one and I couldn't live without it.

The other caveat is that indeed the motor must be raised so that the fin planes the water at speed. Otherwise it may provide the desired lift on the hole shot, but it could also impact top speed.

Band-aid, schmandaied. Tune your boat with a prop that delivers WOT at max spec RPM, raise the engine to the optimum height and that's what's needed anyway. With that accomplished, add a fin and enjoy the added benefits.

Braking off the AV plate, collecting trash and weeds, etc. are all urban legends.