diff chatter

[AUTickford]

I have a s1 forte v8 auto,when you go full lock and boot it[sensibly doing u turns in traffic]The diff makes a real nasty grinding,chatter noise and goes single wheeler as opposed to the lsd working normally taking off in a straight line.I was going to have a crack at the redline friction modifier when i service it soon but havent used this before,apparently its designed to stop chatter in clutch type lsd,s but being that the au is the cone type clutch i was wondering if it would do the same thing.Any ideas or does anyone use this in their lsd? oh yeah last time i serviced it i used lsd oil and penrite lsd additive 7098 but that service was done about 40000 km ago at a guess.