Agree. But also checking the AV plate is also a pretty good indication of reasonable water flow. I confirmed my height by running at fast speed. With fast trim. AV plate (the lower of the two) should be out of water but getting lightly splashed. I run water pressure gauge but never run out of cooling.
In practice it is tricky to witness AV plate. See my unsuccessful video. My camera man complained and I realised after, the trim tabs were causing a lot of the spray as we had a bit of a lean to correct.
Lifting engine will I increase revs so be prepared to hit rev limiter earlier. There’s several theory’s on adding an 2” pitch or so for 300-400rpm etc but it’s all trial. I run a 23 or 25 and both work but the 25 needs a gentle throttle to get up, but gives me more speed. 23. Is the everyday and I favour rev4s now as a do anything prop. It all depends what you want to do with the boat and how fast you want to go.