I have a 20' Seaway cuddy cabin with a 150 h.p. Johnson Ocean Runner. At wot i was only getting 4800 rpm's. At 4000 rpm's i was going about 24 mph. Not sure what the pitch of the prop was but I had it turned down to a 13 pitch. Now I'm getting 5200 rpm's at wot. At 4000 rpm's I only get about 19...