What size tire are you running? 28 sounds a bit small. Figuring out why it won't 60 ft well is the first thing to do. Is it spinning? Carb issues? Get those things in line and get it to 60 ft within .005 to .01 and you will be able to tune it better and maybe pick up more yet in the 60 ft. You may need better shocks for proper control, and maybe bigger slicks. After that, you can decide just where to go. Since you have worked with Dwayne, his input on what a cam change will do is where I would go for best advice. I think it would pick up a bunch with a roller with more duration and more lift, but he knows your situation better and what all would need to change, and potential gains.