I think with a 90hp on that hyperlift hull you should be able to turn a 19p black stainless about 5400rpm.
I have the same size boat with a Yamaha 2 stroke 75hp, its the same motor as yours but tuned down.
I turn a 17 powertech 5400rpm 41mph
I turn a 19 Yamaha black stainless 5000rpm 38mph.
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