I have also had a couple FTF's. It seems some mags have a little too much front to back play. This allows the front of the mag to drop down a few thousandths too far, allowing the bullet tip to ram into the flat just below the feed ramp instead of the feed ramp itself. I might try taking a dremel to mine and cutting mini "M4" ramps in it. i think it will work.
So, I stripped my rifle down a couple days ago and carefully took a chainsaw file to both sides of the feed ramp. You should be able to see the copper line up either side of the feed ramp where the bullet tip rides up the ramp. Right at the bottom of these "lines" is where you want to file your "mini M4 ramps". Easy does it. I took mine down maybe another 1/16th of an inch per side. In the first 100 rounds I shot through it, I had 3 FTF's. Since I made the mini M4 ramps I have just over 200 rounds throught it with no failures whatsoever!