There's one huge problem though. The minutes for Golden State are way off. In looking at the depth chart, Curry, Iguodala and Thompson are set to play 10 minutes over their recommended minutes. Meanwhile Speights is 10 minutes under and Livingston, Barbosa and Barnes are 5 minutes under. Justin Holiday isn't even set to play. I didn't look to deeply but in skimming through it looks like all the teams default minutes are screwed up but none to that extreme and none where it benefits as much as it does for Golden State.
It's interesting that this is the default setting for them. Regardless of why it's so off, it doesn't allow for a fair simulation. I'd be interested to see how they fare if you manually adjusted the minutes to real life. Golden State's Advanced stats are great but I would bet the results would be different.