Reforging Bench could be better

I put in three Magic items with three modifiers each and got out an item with only one modifier (it did not even match any of the modifier types on the input items). This seems like a REALLY bad gamble system with too much variance and bad output compared to the cost of the input.
I would suggest some refinements to the system to keep the gamble, but make it not as awful:
1. The output item has the same number of modifiers as the items that were input

2. A guarantee that at least some of the modifier types from the input items get put on the output item (numerical values could still vary, introducing that element of chance)