Evinrude ETEC 250 HO
S/N: 05227273
'08 Year Model
Model E250DHLSCS

I just replaced my Lightening lower unit with the M/2 gear case. The problem is that I cavitate and spin out every time when trying to plane out once I exceed 4500 rpm, before getting up. Never had this problem before. I have a 3 blade Raker II prop, with three 5/8” holes, one near the front of each blade. I’ve also lost ~6 mph off top end. Any thoughts on how to fix this would be greatly appreciated!