Swim has a feeling that the problem doesn't lie with the gassing method. VE's gassing method works fine! The problem is most likely with the pill stock.
You wouldn't happen to bee using generic 120 mg tombstones, now would you?
Post 491712 (https://www.thevespiary.org/talk/index.php?topic=8277.msg49171200#msg49171200)
(Scottydog: "Problem gassing generic 120's", Stimulants)