I'm surprised there's so much talk about using a hair dryer to straighten out bent records on some of the other forums. It did absolutely nothing for mine and the record barely even warmed up. I wonder if I just didn't give it enough time, if that hack doesn't work and those recommending it have not actually used the technique, or the hack works on vinyl that is less warped or maybe vinyl that is thinner.
Although hair dryers get pretty hot, I'm not sure they get hot enough to fix a bent record. Maybe they can though. There are so many variables at play that what works on one vinyl record won't necessarily work for another.
Did you try the pizza stone? I'm curious about you kept the pizza stones from scratching your vinyl records. If you haven't tried it yet, something glossy like ceramic tiles might do the trick. Another option might be wax paper.