This worked for the feeding issue. I had to shoot the Match a bunch today because the Razorback busted.

   This for sure kept the ammo from standing up and the magazines ran fine except the other issue with Witness mags. It seemed pretty often the magazines would drop down and kick the top round up without hitting the release. I am going to sand or file the pads down a little so they clip in easier. My old ones have a pretty nice groove from so much use, but not these! Sand or file?

   I filed the two problem base pads today. Neither one latched in correctly as my trials showed.

One mag took about 2 minutes with a file and the other took 10 minutes because it needed more fitment. Hope to try them again real soon!

Where th top of the pads hitting the bottom of the frame? 

Yea. I'm going tomorrow with the Underwood 135 and 165's since the tracking shows they will be here.

   Today was round two. No issues with feeding and the mags cleared after filing to pop into place. Today's issue was one would pop back out! I took my needle nose and bent the catch out just a little on the mag. Problem solved.

Good job. Wondering if that was the cause as I had same issue with the compact steel. Older Compact steel ran 10 round mags, now they are 12 rounders.