Back for some help!

I have a heat lamp for my leo and it is putting out all of the right temps. My thermometer can see the highs and lows of the day, which are coming out correct for day/night temps. I've even taken temps inside the hides just to get a reading and they also are in the correct zones. I can tell he is regulating his heat, sometimes parts of him are sticking out of his warm hide.

However, sometimes when I pick him up, he seems pretty cold. I've read that leos need underbelly heat, leading me to think I should be using a UTH. But he's eating fine and has "done his business" twice since I got him and everything seems normal.

I just need an opinion on the UTH, the guy at the store asked if I used papertowel (i do) and told me to not use a UTH if I was, because it would cause problems getting a correct temp? Anyone using a UTH and papertowels or is the lamp fine as long as I'm getting the right temps? Thank you all!