something isnt right.. Youve been from 24, 26 and now 4/5 hours later only 28. These UTH's heat up fast.. I have a couple different kinds and all are smaller 8-12watt and they go from OFF to 100 within 20 minutes. If you put your hand on the floor of enclosure it should feel about the same if not a bit cooler to you as out temps are 98... If its cold something is wrong, if its hot the same.. If I were you when you have the lazer to use check the inside temp of floor and see if your thermometer is wrong, if not then unplug the Tstat and run the UTH direct and see if it will heat up unregulated.. If it gets up to 100-130 within 20/30min you know your tstat is no good ect....
This is directions and pics for running Tstat and Thermometer, no matter if its a glass or Plastic enclosure.
https://ball-pythons.net/forums/show...-With-Pictures!