Hi boch,
The BMT or ATG question is not an easy one to answer, even for the most seasoned doctors. But if you want my non-expert opinion, I think it sounds a little too early.
My counts didn't really start to rebound until the middle of October, after having had ATG in early August. And I was bad! Platelets crashing down to "3" every couple of days, HGB at 4.1. Ugggh!
It may sound a little strange, but I've always thought of the decision to go to either BMT or ATG like counting cards at the blackjack table, with some factors calling for the BMT (A hit) and others ATG (Stay).
No response to ATG: Hit
Dangerous ANC: Hit
Being under 40: Hit
No matched sibling: Stay
Older than 50: Stay
A good doctor should go through all of these factors in order to come up with the best way to play the hand to beat the house (Aplastic Anemia).
Anyway, that's how my goofy mind works.
Good Luck!