First off, make sure that you have cleaned and CLP lubed the upper bearing surfaces before you shot the rifle again. A rifle that is strongly/correctly stroking goes a long assisting the mag to get it's top round in the correct position for a clean strip (the jolt of the buffer off the back of the receiver extension/Buffy tube).

As for the mags, pull them apart and check the bottom of the feed lips and the front inside edges for burs.  If needed, use a stone and clean up the burs.  After or really before that, use a wood ruler and force the mag followers all the way down, and then let them snap back up under the spring tension about 20 times each.  What this achieves is it mates the follower to the insides of the new anodized mag (smoothes out the inside of the mag body, and knocks off any production seams on the follower).