[8D] I honestly have never had any problems with the regulator setting. It has always been flush it up with the lip of the flange and forget it. We have no problems getting 8400-8600 RPMs on a 16x11 or 15x12N or 17x10 with the sports. I am bing totally honest when I tell you that barring fuel quality, plugged fuel/vent line issues they just run.. They really really do for us. We are at sea level, but it gets extremly hot and humid here in SE Texas.