What are you using to compound the gel coat? I have gotten good results with a wool pad, heavy compound, and rotary buffer set at 800 rpm. I use a heavy compound by Malco that is one step; you wax it after the heavy compound.
Meguiars makes a gel coat restoration kit that I have heard good reviews on.
2006 Bayliner BR205
A1 Gen 2 1.47
5.0 carb engine