Moped Army

on my moby i'm running 2 big weights and 1 small one and my accel is good and it tops out at like 52 but when i hit 45+ it get boggy. The ped hits that speed and u can hear an rpm decrease after a second and the accel slows alot.

Do i just need to play with the weights or get a taller front sproket

also i don't know how far up the belt climbs the ramps but it stops with about half an inch of ramp still showing and doesn't climb any higher

11x38 gearing btw