Well, there is already a system in place to bulk produce. Most of the recipes allow you to bulk output on HQ with one tool (either main or off hand) while the other tool allows you to HQ +1, +2, +3. The problem with bulk output is the same problem as with +1/+2/+3 - it seems to be entirely random with little to no effect from your stats, rank, gear, etc. If this were addressed, then both the +X HQ items and the bulk items would be fixed.

In fact, when I am grinding for SP, I make sure I always do it with bulk output so that when I do random HQ, I don't generate a whole new stack of items that takes up inventory space.