Rear drums too tight

Things to look at. Look closely at the top pin where the shoes rest. Make sure they are all the way against the pin. Sometimes they will get hung up there. They can also get hung up on the ridge around the circumference of the backing plate between the pads the shoes ride on and the outside lip. Check the parking brake strut that it is installed right. Sometimes one slot in one end will not be seated and hold the shoes off. It can fool you so look. Lastly, MEASURE the shoes in the center front to back. Make SURE they are 10" shoes and the parts store didn't give you the wrong ones.