Thank you very much! I will do so)Is the backlash from the dreailer or the hub? In my experience the hub is the culprit even though you see the the derailer 'kicking' (the freewheel isn't coasting so it pulls the chain which pulls the drailer). I'd say pop the freewheel apart, clean it, lube it, and then see how things work.
Did you solve the problem? It seems I have a similar