Hello
Hmmmmmmmmm…...
You’ve got to wonder about someone’s logic when they say: “fight through your Savasana - to get your repose”. Yeah right 
Relaxation is a learned skill. And at the moment your body is not able to surrender which means your mind is also fighting the position. I mean, you are probably even experiencing massive self-talk about how uncomfortable you are. If you weren’t in the studio and someone asked you to lie down on your belly in the most relaxed way possible you wouldn’t end up in classic belly-down Savasana if you have large breasts! Would you?
My advice is don’t fight it.
Here is what I did when I was well, larger. I am actually quite flat chested now, but I breastfed my girlie. When my breasts were full there was no way I could lie on my chest without pain. So I am guessing the sensation for you could be quite similar.
The steps:
* Fold your arms so that your forearms are parallel to the mirror and your hands lie passively and relaxed.
* You can place your forehead on your top forearm.
* Or you can turn and look to the right first side and then to the left second side of each pose.
Simple
* Actually you should have no difficulty looking to each side. And you can swap the arms so that each arm has a turn at being on top.
* This was particularly useful for me because I also wear hearing aids (that is a whole other story!). But when my hearing greatly deteriorated a few years ago I had to rest my forehead without turning my head in Savasana, so I could hear the teacher even with my aids in.
Once again it upsets me that the dogmatic styles of some teachers actually stands in the way of YOU getting YOUR RESULTS. A student should NEVER feel intimidated by a yoga teacher (ie feel guilty that they aren’t listening to their own body).
Please come back and report what works for you!
Namaste
Gabrielle