Firstly thanks for any help y'all may have. I have a 1989 Bass Tracker Tx-17 with a 60 horse evinrude. Plenty of power for the boat, planes out in a second but I can no trim up at all without it porposing. I get about 33 mph with just me, normal fishing gear, 12 gallons of fuel and two batteries. I feel like i could get another 3-5 mph if I could trim up at all. I feel like I'm running with 3/4 of the boat in the water. Plus, with the bow of the boat held down to the water so hard, I feel like it would handle differently if I could get it to trim up some. It has a 17 degree prop on it. Runs right within the rpm range at W.O.T. I've heard adding a "whale tail" on it helps but I don't understand how? Any opinions?