QRD2 appears to use scripts to achieve all of its functions, which is a good solution for what that mod is trying to achieve, but the Quantum chest is a lot simpler. the chest contents aren't copied with modded scripts, all the chests with the same Link just reference the exact same inventory. This feature exists in the vanilla game if you use "/cheat all", I just made it obtainable without cheats (thanks to the previous modmaker), added circuit connection compatibility, and will add filter support in the next version (probably quite soon).
Long story short, these chests shouldn't cause any more UPS drops than vanilla steel chests would.