You have to keep trying. I've passed through a lot of frustration too before winning some. And please, don't sag off everyone! Just sag off players who drive all the time (look at tendencies in the coaching menu) and C and PF who like the post thing. But watch out for people like Big Z and Bargnani, don't sag off them just because they are C! Play tight off ball too on good perimeter shooters, the ones who come off screens and pop a mid jumper or a 3.
Damn I lost my next game vs the Raptors, a Bargnaniless Raptors! Lost by 1 in OT! But I grabbed a ton of rebounds and Howard went again for 11. Numbers are settling, but CPU commits much more fouls than me so far, so I gave +2 to Human in the shooting fouls slider to see what happens. Also I lowered 1 click the Hands slider, because both me and CPU are averaging between 9 and 10 steals per game. I know this will go at the expense of turnovers, but it's a test. And I lost the Turk for 2-4 weeks! These are corrections made to cope with my style of play, they don't want to be universal. So stick with the original set, try to be competitive and maybe then adjust to your liking.