I was helping my buddy tune his cub today and while it's going pretty good it seems the bottom end is still flat. I understand it's a 421 shee and it's power isn't low but it still seems off. 421with race fuel domes, 35 pwks, k&n's no Air box, +4 timing, t5s, 162 main, 52 pilot and middle clip with air screws 1.5 out. Were about 700ft asl and it was 80 degrees today.