yes welcome to the craptastic stock r200lsd, openwheel city.
aftermarket lsd centres are the best option but REALLY expencive, 1500plus. i rebuilt mine with nismo clutchplates and it locked up at the drop of a hat. it was really good.
i recomend that you rebuild it with the nismo clutches.this basicly makes it a nismo one,ive seen both pulled apart and they are the same. il get back to you tomorrow with instructions for preload etc. its not hard at all.
i have all the part numbers at work for them.6 in total.