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PhilDAS
finger_jockey
It sounds like your lock ring could have come loose, creating some play in the cog's thread. Anyway, how about considering this from Halo;
http://www.halowheels.com/product/rear-fix-g-track-hubs/
Relatively inexpensive compared to going high-end and discovering your Forsterman-like powerz still strip everything you look at.
Edit; like @PhilDAS said