Nope, looks like normal wear.
I'll use the claw tool to knock off the product residue build up. Using a terry cloth towel would be really inefficient for those pads. It might hasten their wear, and you might end up with cloth fibers in the pad, and pad particles in the cloth.
The HCC 400 might be effecting the foam a bit on the previously used pads. I've done a few test spots with 400 on those blue pads, but it wasn't enough to see if it had an adverse reaction on the foam.
If you ever get a chance to try Zephir Gloss Coarse Compound It's well worth it. Cuts more, finishes similar, definitely compatible with the Rupes foams, and smells really good. It even works great with my Porter Cable and trusted green Buff and Shine pads. Just tried it last week, and was really impressed with It's ability to out cut.