I have a 1985 Bayliner 17 foot trophy bass boat with a 1985 force 85. The Previous owner installed a whale tail on the motor. I have had various results using Dolfins on I/O's in the past and am wondering if this whale tail is a benefit or not. I'll probably remove it and do a test but before I do I thought I'd see what the experts think. I currently run with the motor angle pin in the first hole closest to the transom. If I move it back even one hole the bow continually goes up and down. .......And what should I expect for top speed? I currently have a 21 pitch prop and get about 30-32 with just me in the boat...........Thanks in advance for any input........John