Thx, this build was a eco king and the buffer kit (tube buffer spring) was like $20 so…took out and weighed the buffer 3oz. it has 3 separate weights inside 1- .8oz. 2- .6oz. …seems a little weight difference must have an impact based on the 3 weights inside being interchangeable and relatively light, spring 10.5"…knowing this, what do I try next?