Reviewing this thread again with equations in hand, I had a new question. PE, I guess this is directed your way or maybe Kirk would know as well.
The crystal type chart in the OP gives pAg at 70C. But since the Ksp of bromide changes with temperature, pAg and vAg change with temperature too. If you are trying to make say, cubic grains, at a different temperature like 50C, do you aim for the same pAg, say 7, for a cubic grain? (Or t-grain, or octahedral or whatever you want to make)