I hear that, harry.
Didn't realize you had the 20" shaft. I have similar concerns with a 20" on a Seafari.
I would think 140hp making 5800rpm with a 14x19 should push an MA a little better than that. Can't help but think that there's a more effective prop out there for you. Anyway, try to identify your prop model - perhaps its geometry is not optimal for your MA.
If it's not too much work, try removing the hardtop, and seeing if its drag is not the culprit. If its only a handful of bolts it's not much time lost on a simple experiment.
Good luck. keep us posted, Iv'e been looking at Zukes lately based on some of the other guys experiences.
