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Thanks - I have switched the freehub and had the cassette off and back on during the checks to date and certainly seems well cranked down (don't actually use a torque wrench on it but "very tight" is the extent I've gone to which has never caused this issue before over the years so am fairly sure it's not that) - going by that numbering, the ones that are the cause of the issue are basically 11 - 8...!
Just some of them? Could be sprockets moving on the freehub rotor. Make sure the lock ring is correctly tightened, it's one of the threads which often gets too little gronk from people who don't use a torque wrench. The stamped individually mounted ones (5,6,7,8 on the pic, may be different on your cassette) are the suspect ones as they have the biggest radial clearance, so if it's those then setting the lock ring to the correct torque is worth trying if only to eliminate them from your enquiries