I like the Hydromotive Turbo's I have at 21 pitch on a Wellcraft 26' Nova ST
Tremendous take-off without using tabs, topend 61 on GPS could be 64-65 with a 23 pitch prop. Never tried a 4 blade. 350 magnums. Would not change I love the bottom and end and midrange is very good.
WOT RPM 4500; cruises at 45-50 MPH at 3500-4000. Minimal load on outdrives is another advantage of being slightly underpropped. Merc LaserII's were not good as they did not have enough balde surface area and came from Wellcraft with the boat. $1,000.00 waste of $$.
I purchased the Turbo's with a Bravo hub diameter for $299.00 ea. Counter-rotating.