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I had exactly this with my bagman QR, the bolts wouldn’t willingly spring closed to hold the bag in place, similar amounts of slop and the springs felt weak as you describe.
Bit of WD40 with PTFE sorted them right out and they’ve stayed that way all summer, I felt a prat for not thinking of such an obvious solution sooner. Might not fix your issues, but it’s a very cheap thing to try!
Got a bagman QR and the quick release part is very fiddly. Springs feel very weak and lots of slop in the shoot bolt bits make it harder than it needs to be to line it up and put the bag on
Is this just what they are like?