i've learned that my BP's will move around substrate, hides and other enclosure items as they see fit. i have two BP's in a tank and lay down 1/2 inch of aspen on the hot side and up to an inch or more on the cool side. (my female normal sometimes likes to burrow.)
i think it's fine that your BP moves the aspen around to get closer to the heat source as long as your UTH is regulated by a thermostat and temps don't reach dangerous levels. a 90degree hotspot is fine - that's what i try to keep mines at. seems like he's a little cold, wants to warm up a little and get comfy.
and yes, get another hide and put it on the cool side for when he wants to cool down and switch.
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