It's just me, but I would put the SM81's on the OH's instead of toms. That being said, I don't own SM81's so I can't try it out. I say go for it, though. Wouldn't hurt to try, I guess.
For me, I use Audix D2's on my high toms, Audix D4's on my mid floor toms, and Audix D6's on the low floor toms. Then a D112 inside the kick and an AT4033 on the outside of the kick. i5 on the snare. NT5's as overheads but I'd change that if given the choice. Probably with SM81's or Josephson's.