Well, ideally, the pH of an emulsion should be between 5.5 and 6.5. IDK offhand why yours is so low. You might uses some Tetra Aza Indene in the emulsion as described in the formula by Jim Browning. That can work to advantage sometimes, but it does change the pAg.

Burt Carroll changed a lot of his opinions after he began working on emulsions at Kodak. Some of the work you are referring to was done at the NBS before he joined EK, right?