Interested in hearing some opinions, got a 13 3/8 X 17 stainless on my 19 ' skiff with a 90 hp ETEC. Wants to porpoise above 4200 rpms trimmed all the way down, plus I think the max rpms I've gotten is 5100 or so, too low below the max which is like 5500-5800 i think. I want to switch to a 4...