You've done what I'd suggest already. Is Wolf+5% the same as the extra power spring that TF sells? Clean and degrease the inside of your tubes, make sure the follower isn't binding on the trip up the tube, no burrs. Check the lip spacing against mags that work 100%. If the mag is crapping, dump it. Don't fall in love with mags, they are consumables. Do they run with a regular base pad on them? The buffer system should not effect mag feeding, just a coincidence I think. Since it's just the first 10 rds. in a 42 rd. mag, I bet it's the TF combo.