My room gets chilly in winter because I'm in Southern California. We don't run the heater unless it drops under 68 indoors. I've never had a problem with my reptiles on a 3" belly heat. They just tend to hug the back end of the tub a little more. And in summer when room temps warm up, they hug the front a bit more. Works well enough for me.
You can also try getting a square hide that fits a little more snugly over that back end to allow the heat to stay in a more compact space instead of mixing with cooler air as easily. I'll do that for my babies when the temps drop and they love it even when they don't quite fit as nice come spring XD;
My concern is that even though the probes may be reading the correct temps, heat rises. The air temp in the tubs may actually be higher and can cause issues down the line. If you see them starting to spend more time in the front or middle of the tubs that could be what's going on.
Another question is.... how are your probes places and what thermostat are you running? I have never had to run a thermostat at that much of a difference... Mine generally only run 3-5 degrees higher than the hot spot (88), not 15.
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