Drop them to 85 for a couple of weeks see if that helps any, it won't physically hurt them. Mine are not in an air conditioned room and I have them on ambient temps during the summer months.
I have the same problem some love to soak or tip their bowl. I attribute it to the heat since during the cooler months I don't have problems with tipping or soaking.
Do you have plenty of holes in your tubs for ventilation? Making some more holes in the tubs could help as well.