No, keeping the temperature consistent means keeping the warm side between 92-94 and the cool side between 82-84 constantly, no night drop, and no single temp for the whole cage.

Balls don't respond well to temp swings and that's probably why he's not eating. Also, I would get rid of the half log, they are horrible hides. They don't provide any security whatsoever and he'll be sandwiched up against the cold(75, which is probably room temp, is cold for them) glass, which could lead to illness. I would make sure to have two identical hides so he doesn't choose a hide he likes better, and won't properly thermoregulate.

After you get his enclosure fixed up(maybe cover the sides with a dark sheet or towel), leave him completely alone for a week, except for changing water, and then try to feed. If he refuses, wait until the same day next week.