I just finished the bike.
The chainline took a bit of work. I put a 107mm BB in and .7mm spacers to move the chainring in. Ive got another .7mm spacer to move the cog out. Im running a dura ace cog and lockring.

Everythings working like cake except the lockring has been coming loose when i try to skid. I put it on with the lockring wrench, it came loose when i tried to brake with it.
I got it down tighter and it works fine to slow down with but it will loosen when i try to skid. Ive tightened it several times myself and had someone at a shop tighten it down. Still comes loose.

Im assuming it all comes down to the quando hub, but does anyone have any ideas for tightening it down? If i use thread lock will it ever come loose if i want to change cogs?

Oh yea, does anybody think the loosening could have anything to do with the spacer on the cog?