Hmm, don't know about what happens when you heat it -- I've never tried!
Yes, you do have to be careful if vac-bagging not to squish it. I stopped the vacuum before it was complete -- still sealed, evacuated of most of the air, but not enough to squish the cheese. It has worked well.
That said ... I think you could get some of the same effect by putting it in a ziplock in the cave to give it time to finish. But again, I've only done two blues, one of which I consumed when it was still at the "not so great" stage, and the second which I'm still working on. Come to think of it ... it is time to make another!