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salad
Sorry everyone for the constant spam about this but im 95% sure this was the issue !
I checked the guide rails...lo and behold there was a couple of TINY chips/scratches out of the top one right where the film exits the canister (pics to come in a minute). I chucked a roll of film in and ran it back and forth over the chip like it would in normal use. It started scratching the film and creating the dust again!
Broke out a needle file and very gently filed the rail smooth, making sure to only run the file in one direction. Cleaned all the crap out from inside and loaded a roll. The reason I'm so sure this has worked is that now when winding forwards it is MUCH smoother, where previously it was incredibly grindy. Thanks for the help @Ste_S and everyone else ! I promise this will be my last post about this