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@pip
By installing well, I mean grease well, install by hand and then snug down with tools/rotafix. Then go for a quick ride (without using any back pressure), which will probably tighten the cog on further so you'll need to snug up the lockring. Your wheel should be good to go now.
The problem with the Jnrs is that the threads/hub bodies seem 'soft' so a cog tends to a 'bite' a little into the hub body over time. This introduces a little play between the cog+lockring and as the lockring threads are also a little soft, the hubs have a tendency to strip under back pressure.
So they just need a little babying. BTW DA lockrings are only a fiver from http://www.hubjub.co.uk amongst others, so hardly a real expense. Well worth it.