My 5 BPs ranging in age and size are in a 5 tub AP rack. I use UTH 11" Flexwatt. And VE200 Stat. Cool sides in each tub range from 79-81, warm sides 89-92. Ambient temp now 76. (will get 6-10 degrees cooler in winter, but that is for another day).
Out of curiosity I just used my temp gun on the bodies of all, none of which are laying in the same spot of the tubs.
All 5 read 85 degrees! I was happy and a bit amazed that all 5 registered same temp.