This is a red flag to me. Why is your hot spot dropping so much at night? Did you mean to say that this is your ambient/cool side temp? Your temperatures should be fairly consistent from day to night. What is your cool side temp?
As far as his behavior, though, hiding is what BPs do, especially during the day. He is striking simply because he is intimidated by you. They almost always grow out of it, and it doesn't have to be caused by anything more than you being an enormous "predator" to him.
I have a thermostat on my heating pad to bring it up during the day and putit down to 80 at night, and the other side stays 80 all the time.
And Uro has eaten 4 times since I got him I believe, 3 or 4.