Yes, the experience i listed of failing to uncurse it through multiple Veteran dungeon runs (5 tokens at best) was in Patreon 2.7.2
For that 5-token run, I spent so long in that dungeon run that everyone's gear was broken by the end (and a character that was 5/6 Goals and almost done with a 6th goal got fully curse class equipped as punishment for my stalling efforts. >.<)
Maybe I was just having terrible RNG luck, but after that terrible run I lost interest in trying another long stalling dungeon run.
(EDIT) - Ok, I went into another dungeon run, and I almost wonder if certain moves or buffs are interfering with Cramps.
Entered "BOOM!" battle with 2 or 3 stacks Cramps, after first two machines self-destructed and I destroyed 3rd, i spent 20 turns "Report for Duty" to on the Maid who had the Plug equipped. I think maybe I got one stack in those 20 turns.
After several minutes of not getting cramp stacks, I stopped using "Report for Duty" to stall and used "Wait" instead, and every turn after that got a stack of Cramps and once the forced cramp move. Practically instantly ready to "Expel" compared to the minutes of waiting before.
Either that was just really weird RNG .... or something in those 20+ turns was interfering with the plug stacking cramps debuff. (?)