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I did give it the old gt85 and rag treatment but no change. I didn't notice anything odd cosmetically and nothing seemed stiff or out of sorts.
The shop rang me just before the end of the day offering me a pro (shimano) dropper with lever for 165 which I will say yes to unless any strong opinions warning against them. The shop did me a favour in lending me a proper seatpost for the weekend without charge so I can go ''''bikepacking'''' which was jolly decent of them.
Calumonwheels
It might not be the cartridge, if it's still returning and going down again. Check the actuator on the bottom of the post, I recently worked on one that was just corroded and sticking. Cleaned up and it sorted it.
I'd be tempted to upgrade to a better, more serviceable dropper if that's not the case though, OneUp have been flawless for me, and their customer service is amazing