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thanks - appreciate the advice
i actually handed the bike over to bike shop to diagnose an issue with the front brake (master cylinder has actually broken in the lever - thanks shimano........)
they took a look at the RD and were also slightly puzzled by the chain slap as the hub seems fine. they think the RD might be faulty too but i doubt it
swedeee
It's usually the other way around, when chain is on the 10t or 11t cog, the freehub has an advantage over the chain /chainset and rides on slapping the chain stay or causing chain to get thrown ofd.
Well sealed hubs (hope, i9, ck) naturally have more friction to over come. You can get proper freehub seal grease (even thinner than pawl grease), would very much use that and not a solvent like wd40 (which will work for today but make problem worse tomorrow) if your having freehub stiction issues.