Hi.
What tissue are you using? If DRG or spinal cord, yes I skip the boiling. I use the fresh frozen protocol even though my tissues are fixed. Overnight fix is too much. I’d do 2-4 hours.
I use protease for 30 mins at RT, per the fresh frozen protocol.
Did you let your tissues dry on the slide at RT for at least 15 mins? That helps. See comments above. You might also use new slides. Maybe you got a weird batch of super frost.
Good luck