I measure my surface temps with an IR temp gun and my ambient temps with ThermoPro thermometers. I'm just having a hard time getting both ambient and surface temps correct without one off-setting the other.
That being said, we have found a temporary solution. I have the RHP mounted in the center to maintain a majority of the ambient heat, an UTH under the hot side to maintain a hot spot for a slight gradient if the snake so chooses, and in order to stabilize the general ambient temp we had to run a small ceramic heater in the closet which the tub is in. All heating devices are on thermostats of course, including the ceramic heater. This is giving us temps of:
80 ambient temp hot side, 80 ambient temp cold side
90 surface temp hot side (on top and under hide), 80 surface temp cold side
This is exactly what I'm going for, but this means we are running a total of 3 different heating devices on 1 quarantine tub just to get it up to temp, which frankly is just ridiculous to me in theory (never mind the electricity costs) so though it will work temporarily, I'm going to be aiming for switching to a PVC enclosure with a simple RHP ASAP.