I think 20 or 21 is max on any of my pages also and I've got all sorts of hacks installed, including the estore and points with gifts and add on's, p3tz, arcade, etc, etc. And I knew 160 was ooouuuch. I only had a few categories and FOUR thumbs showing also. So, it's not like I had a massive amount of things going on.
I just paid for my photo post license and I'm anxious to get it going! YAY!