I'm having problems withthe Easton high end carbon seatpost clamp. As I ride the seat slide back over a inch? Even though I tighten the seat clamp screw. Do I need to get a new seatpost? Anyone has this same problem with this seatpost?

FSA and TACX both make a carbon assembly paste that will help. I was having the same problem with my EC70 post, but after I put the FSA orange goop on the saddle rails, the problem ended. If your LBS doesn't have it, there are some places you can order it online.