This year one on one steals seem to need an angle. IRL, how many steals do you see when the ballhandler is faced up and dribbling in place? Like IRL, you're more likely to get steals as they start to drive. You can also get steals by stripping them from behind (that "jersey tugging animation") but this results in plenty of fouls, as it should.
Adjusting your coaching settings to front certain players in the post will get you a few more intercepted passes a game as well but I recommend that you wait until after the first quarter of half to see if this is necessary. If you start the game off like that, the CPU will adjust and find better passing angles resulting in spin-off alley-oops and other uncontested dunks and lay-ups.
Double teaming someone in the post works best if you let your AI teammate defend in the post and you manually bring a guard over to attempt a steal. Using the LB double-team while you're being backed down will again result in an open look for someone more often than not.