Does the highest possible Max Bust Size increase with every Safe Zone you come across? If not, then they should have it so the maximum that you can achieve doubles every Safe Zone you come across, in case it's intentionally limited so the floors aren't easily cheesed.
If anything, I at least want EVERY trap that's triggerable to be survivable, as in without getting a game over/falling unconscious, as long as you have enough Max Bust Size, even if barely.