Hey T
As far as the flowering goes, yes I guess it could be because it's bag seed, don't forget also you took clones, maybe the plant needs a few days to repair itself ?
As for humidity mine has always only been around 21 - 26 % , during flowering you need the humidity low or the risk of bud rot increases, a higher humidity is better during veg tho.
As for the heat issue, do you have a window in the room your closets in ?
I have mine open constantly to keep my temps down, other than that I would suggest maybe putting a hole in the door to your room (easier to do than putting one in the wall) & use a fan to blow more cool air in that way.
Hope I helped you T xxxx