Low Water Pressure within Bathtub & No Hot Water?
FWIW, my dampen pressure and hot water be just fine in the past I replaced the cartridge.
Answers: Cartridge installed reversed or "Temp limit" adjustment on element needs to be reset ( refer to directions beside cartridge).
You can also remove you showerhead and clean the "washer/screen" within case some small particle are caught there.
check if the so call Moen Cartridge you changed was reversed, enlarge and change the other style around, dont blame you we all breed mistake, water pipe will not block as you mentioned, Good luck
More Questions and Answers...