[Neus]

The debug messages should be showing you the trap level, success rate, roll, and trap DC. Dungeon traps have a level of 1 + 1 per 10 dungeon levels, and the DC is its level * 8. For chest traps, it's the chest's level * 10. The chest level should be the same thing, 1 + 1 per 10 dungeon levels. So in a level 60 dungeon, the DC is 70 (I believe).

What could happen is the roll system changed to be a range, with the minimum being 25% or 33% or 50% of the maximum roll. So at Disarm level 5, it'd be a roll of 50 to 100 (if 50%). Which would considerably lower the rate of failures by itself.