As part of the game whenever you put a throwing item in a encrusted/kronged/othered stack it gains the boosts while in that stack and loses them when taken out, the problem is that if you put a boosted item into the stack it loses all the boosts and doesn't regain them. This notably happens if when combining stacks of thrown items you put the boosted ones on the plain ones instead of the other way around causing them to lose all their bonuses.
The real problem is that you can Krong or Encrust throwing items at all. Expendable weaponry isn't intended to be that strong. I believe this is being looked into.
