These seem like some critical parameters, but I'm not sure what a lot of them do... for instance I discovered I could fix issues with constraints "breaking" by increasing m_numIterations to around 40 or 50, or by increasing m_erp to around .8, but the latter suffers from jitter. m_erp2 doesn't seem to do anything... I have no idea what m_sor does... well you get the idea
Thanks!