I/O Performance Advise

[Ripcurl]

I have a Silverhawk 24 i/o and have a prop slip problem I'm trying to solve...~30 - 35% depending on load. I know it's not a perfect comparison, but there are more Seacrafts out there than Silverhawks so giving it a try here.

Details below... my question is, can anyone with an i/o Seacraft 23 give me a sense of where you're WoT slip % is? Any comparison is further complicated by fact that I have a Yanmar 4lha 240hp that turns up 3550 max RPM. Only Seacraft I've seen with a diesel is that redone Potter hull going for ~100k+.

Many thanks,

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Engine: Yanmar 4lh
HP: 240
WoT RPM Range: 3450 - 3550 (Heavy / Light load)
Sea trial WoT RPM: 3550 - 3650 (Heavy / Light load)
MPH WoT: 34 / 35
Drive: Bravo I: 1.65
Prop: Stock four blade Bravo I 26P