Ive tried the 26, couldnt turn it when the motor was new. Hole shot was awful and sluggish all around. Changed to a 25 temp & 25 trophie, got the best w/ temp. at 81.4 @ 5800(new) Then I messed with the exhaust rings, that raised it a little. I had the cup added and the ears trimd slightly with a few skeg mods. Now Im seeing 84.7 @ 61~62K and Im being told that the colder it gets, the rev limiter going to catch it. I like having rev problems at 85, keep me out of trouble. I like the lower unit, its just getting it with the right prop. You asked about the 4 blade, its not even comparable to the 3 with the cup added to it. (3 to 4 MPH slower new) The one thing is, its gonna blow out to much. If ya add the blow-out ring, it fixes that but reduces the exhaust being a smaller diameter prop. “Drive IT like you Stole IT!”