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Yeah no intention of stripping it further.
I've given it a pretty thorough clean and light grease and whilst it feels a little better it's far from light and still noticeably "clickier" than the 105 it's replacing (but not in a good way). I'm going to get some more aggressive degreaser (Muc-off chain cleaner) and a smaller brush to try and grease more evenly onto the gears and see where I can get to.
Oh and it's true about 9000 hoods, they can tear easily...
You’re right it does seem to be heavier than normal, especially if the first video is without any cable tension. Other than inspect for grit or damage inside the shifter head, there’s not much to do short of partially disassembling it, which I wouldn’t do again (spoiler: re-assembling is the hard part)