I'm having a similar problem with my MTC2 FWD car that I just built. The ProTek 160 servo is not "shallow" enough. Can barely set the gear mesh since the servo is butted up against the motor. Don't want the heat off the motor that close to the servo either.. So I started looking at shorter servos. Looks like the Sanwa PGS LH2 is a few mm shallower, but the MKS servos are very, very short. They're both expensive servos. I know the Sanwa is very popular but don't know much about these MKS servos.