I recently upgraded my single bowl master cylinder to a duel bowl with the kit from CJ Pony. Ive never been thrilled with it since installation. It feels like ti takes a lot more effort to stop now. Today, I did a panic stop and found that the rear brakes lock up. It seems like the rear brakes are doing the majority of the braking. Should I install an adjustable proportioning valve to my rear brakes? If so, would that improve the overall braking of the car ? Oh, Im running the original 4 drum setup.