Just what I thought - PSA is running the Armalite AR-10-lengthed carbine receiver extension. Never knew that until I was looking at sketch's rifle up close, trying to figure out a cycling issue. In your case, Merle, they at least got the buffer length correct - that length tube has to run an AR-15 carbine buffer, 3.25" long, and it should be an H3-weighted buffer. If it's NOT an H3-weighted buffer, then it's not gonna have enough weight for the Big AR to function properly. For sketch's gun, they had a damn 2.5" DPMS LR-based Carbine buffer in it, and that thing was causing all kinds of issues.
The spring is WAY off. With that PSA setup, I'd honestly just buy the Armalite EA1095 spring from DSG Arms, and run with it. That spring WILL work with this setup.
Check that buffer close - see if it's an H3. If it isn't, find an H3 buffer.