I wish I'd seen this post when you posted it because every bp will have bent scales like that occasionally from either being coiled up or caught on the hide or things around the viv and is absolutely nothing to worrie about. . Yes your temps are a little low but as you said your working on it. Make all husbandry like that your priority and get them sorted as soon as you can. I would also maybe not mist the viv so much if your holding 67% or maybe I just read that wrong.
As for the weight, all bps grow at their own rate but I would feed an appropriate size once a week and you'll be fine and he will put on weight at a normal rate.
No offence to others but IMO this post was totally taken In the wrong direction and there was no need to try and scare you or take such a drastic approach. This is my opinion anyway.
Good Luck