Posi-temp cartridge has low pressure
I have a problem with a posi-temp 1222 cartridge I recently replaced. The leaking has stopped in the tub, but the single handle lever does not operate properly. It used to shut off at 6:00, and rotate counter clockwise to very hot at 10:00. Now shut off is at 12:00, cold is at 3:00 and very hot is at 9:00. And the pressure is always lowin the tub, but not in the sink or other bathroom. How do I reset the water flow so that off is at 6:00, and improve the water pressure?