Yeah newspapers and papertowels get jumbled up quickly, but I take a piece of plain paper, like copy paper, and he never disturbs it. Its just to flat and thin an edge.
The thing about UTH's is the temps can vary a lot, and they really are made for snakes and such that like warmer temps. I used to use all the same brand and size (Zoomed mini), and some be hot enough to would melt plastic while others were tame. Of course now I just use heat cables, which are steady and mild, until I get fancy cages with underbelly heat....