I am currently testing in the Darktaur area, they are pretty weak mobs that easily hit +1000 damage. I have killed 100 and the weapon has only consumed 5 points.
These points have not been consumed by a quick change of weapon, it have been consumed because I have set a weapon change to 50% and as I said before +1000 hits of damage are easily reached.
Remember that you can't use the "Script + BOT Config", that's probably what's screwing you up.