More troubles with new master cylinder

I ordered a new dr drift 1 15/16 master cylinder for my 71 Dart. Manual drum brakes on all 4 corners. Had a really rough time bleeding brakes after install but finally got all the air out. Now, after some test drives my rear brakes get way too tight, so bad the drivers side was smoking. After looking into it, I thought maybe the self adjusters weren't working right so yesterday I removed them, manually adjusted the rears and took it for a drive. After a short drive I could tell the rear brakes were Not releasing correctly.

I was so stumped I called my Dad to come look for some help. He says the rear shoes aren't returning to the the anchor pin which makes him think the master cylinder isn't letting the brake fluid return to the MC. Does that make sense to you guys? Anyone else had this issue? I'm going to call Cass at Dr Diff today but just thought I'd see if anyone has any other ideas. Thanks in advance for any help.