ok here is my question i have a os vspec im running 30% the guy at the odonell both at the ihobby show said i can run only one shim in the motor i have 2 shims right now a copper shim and a silver shim if i remove one shim what diffrence will it make in the motor? will i see any more top end? lower end... what i have no clue have you ever heard of this please give me some info if you have any on this issue