No expert here by no means! But I will tell you what worked for me back when I would run x447's. I ran 4-3s lipos strapped in about 1 1/2 inches up from the esc mounting area and the struts were on 4mm and it would run good on glass or chop. I've never ran the wire drives like you use, you might want to try regular stock cables to see if that changes anything. If they are making your struts come loose that might be an issue. My fastest was just over 72mph on x447's from Dasboata. My boat ran very well with the x447 setup and it was very stable. Here is a link to one of my 70+ mph videos using those props where I ran several passes with them. Maybe you will hit the sweet spot soon.
TFL Zonda (124mph), Miss Geico Zelos 36 (108mph), Veles 29 (91mph), Zelos Twin 36 (90mph), Miss Geico 29v3 (83.5mph), Sonicwake 36 V2 (83mph), Blackjack 42 (81mph), TFL Pursuit (79mph), UL-19 (75mph), Sonicwake 36 (73mph), Motley Crew (47.5mph), AquaCraft Rescue 17
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