The humidity is far too low, keep him closer to 80%. Tank size doesnt matter, just a little more difficult to keep conditions ideal. Thermometer and hydrometer are best if digital, dial gauges are garbage. 85 degrees is the high end of the ideal temp range, also put the heat mat on the side of the tank. Most of that last post sounds past tense, are we to assume he didn't make it? In terms of the bumps, I don't really see anything, but I'm also not a vet, which I would recommend you see if something seems off to you. Again, these guys shouldn't be estivating unless you are intentionally putting him through a cycle and that should only be done by very experienced keepers if at all.