mine is still chirping on the tight corners but has worn dow a fair bit.But hasnt lost the lsd effect,and still has the bind/unbind happen.like yours cubes.
When it was first done though it was tight as can be.If you have probs geting the lsd back into the housing use nthe bearing caps to guide it back in.dont go bashing the lsd .Aslo remember the way( up/down) + direction they and for that matter everything goes.
Judging from the shim size that i had you could prolly go slighly bigger,though i wouldnt take it past 4mm of preload cause it will be a hard focker to get back into the housing.Also get the little phillips head screws screwed as tight as you can before the crown wheel and 10 bolts go back together.Use loctite heat proof one on the bolts and the rest of the assembly,let it cure then u can think about filling it back up with oil.
If you need help though keep the questions coming.