The last thing the Celtics should do in those circumstances is match the Lakers by playing small ball of their own. Instead, the Celtics should exploit the defensive mismatches. Vlad Rad has to guard either KG or Perk; both would work him in the post. I like having either Pierce or Allen matched up on Sasha. That lineup forces them to guard Rondo with Fisher, rather than Kobe, because of mismatches elsewhere.
Also, of course, our team would be even more dominant on the boards than usual. The only half-way decent rebounder the Lakers would have in there (relative to his position) is Kobe. Gasol is not a great rebounder, and VladRad, Fisher, and Sasha are poor at it. That means more second opportunities, more fast breaks for the Celtics, etc.
On the other end, there's no way the Lakers are going to hit the majority of the long range jumpers they take, like they did in the fourth quarter of Game 2.