How do i keep killing rear hubs?
Back in December i had an OEM hub from my Kilo crack between the lockring and the cog. At the time, the consensus here and between local bike shops seemed to be that me installing a new cog, not getting it tight enough (and thus, the lockring that i did tighten to the cog was not tight enough later, after I'd ridden on it and tightened it further). I rode on it, tightening the cog, then tried to skid, and the cog backed up into the lockring, made a horrible sound, and probably cracked the hub at that point (is the theory).
I replaced that wheel with an Origin8 TrackAttak laced to Formula hub that i got thru my LBS. I greased both sets of threads, put on both cogs with a whip, tightened both lockrings, rode on both (coasting to a stop so as not to back off the cog) and retightened the lockrings with a lockring tool. I even had an LBS check my work and they pronounced them tight. I have checked them whenever i pull the wheel off (chain cleaning etc) and not found them to be loose. Meantime i have been skidding a fair bit and i weigh 250, so this is not easy on the hub, i understand.
Tuesday night i went for a ride, tried to skip not skid, and i felt a pronounced "pop" feeling thru the cranks. When i went to accelerate, the cog retightened itself. I pulled the lockring off and the threads came with it. I switched to the other side to get to work Wednesday, and when i checked that side out last night to see the state of its threads (they look good) I found another crack in the land between the lockring and hub threads. So that side's days are numbered.
What am i doing to destroy these hubs? is it just skidding being a ******? Something wrong in my mechanical approach (mind you i had the LBS "bless" my work, as well). I actually asked one of my LBSs about this and they said that maybe i'd see better results with a Phil hub, but probably not, and maybe it's just too much abuse on the equipment that is really not designed for this use (no one actually skids on a track, etc).
What do you think and what would you do to prevent this?