Ron, the kind of surfactants whose surface tension property is affected by Cl-, Br- or other electrolytes are not very suitable for silver halide emulsions. Those often influence on the photographic properties of the finished product. Also, each surfactant agent has its own surface tension profile and the time required to lower the surface tension after applying. Varying the amount of surfactant makes one kind of difference but the problem is not reliably solved by that approach. Anyway, it seems to me that more thorough investigation of surfactant and foam controling agents should help your problems.

I just looked at your workshop description. It costs $895 per person for five days? For that money, I would do private workshop or consulting... (Tho I wouldn't do that in central US... of course... but I'd do it in central Europe or somewhere...)