Finding the correct carrier, spring, and buffer can be a pretty path of trial and error.
I had a rifle that wouldn't run with an AUTO carrier and any weight of buffer or spring. Even the wolff xp spring and an XH buffer from heavy buffers.com. And that buffer is all stainless with tungsten inserts (as heavy as they come).
The solution was to run the XH buffer, wolff spring, and a SEMI carrier. What sounded like something that couldn't work, did. Good luck man, it's a good feeling when everything starts to work right.