All ranks of Quartermaster when slotted in the ground doff slot does nothing to combat supply recharge time. Slotted or unslotted, Combat Supply's recharge time remains the same.
Edit: Looks like this has been happening for some time. Has it been a decade yet?
https://account.arcgames.com/en/forums/startrekonline/#/discussion/1226986/kit-combat-supply-cooldown-reduction-bug