When I mention WOT RPM, it's mostly from the "don't overload it and cook the exhaust valves" perspective. If WOT ends up at 3700, then cruising at 3300 is pushing it pretty hard I'd think. Actual boat speed at WOT is pretty much irrelevant to me.
But that makes me think it might be worth just throwing the 22x25s on and see how it runs next year. And then decide if it's worth buying more props.