1. I'd probably wait until you can get a level 9 or 10 trainer.
2. Obviously 2-3 increases his interior defense and rebounding and makes his outside defense weaker. If you think you inside scoring isn't good enough to consistantly score on his defense, you might consider moving to a more outside oriented attack (if you outside shooting is decent). Also, if you're worried about losing the rebounding struggle, you might make sure you select your better rebounders for more playing time.
Steve
Bruins