Joe, I had the same problem, and with run out too. But as soon as I rotated the musclechuck, I did find that sweet spot and have been loving it ever since!! Good catch Mike! I read his post and didn't catch that he was spinning the bit, not the chuck! And was wondering why he couldn't get it right. LOL
I've been working on some projects, more of these window treatment things my daughter had me make for her. But with a little change in design. Will post some pics, later on. But having been using the heck out of the musclechuck in my router table. If not being a pack rat with tools, I'd have thrown away the chuck wrench that the router comes with!!