Recently had my first emulsion when doing a 7% prewash with the glycerin. I magined to split it with acid but it wasn't a very convincing split, separating to two phases ... water and what I assume was a dark brown bio glycerin mix which showed only tentative signs of dropping the glycerin.
I think if I'd been more patient, it would have split but as it's log burner season I made it into blogs (or has that word already been coined)
As for subsequent washes, I usually do a titrated acid wash which has never resulted in an emulsion, save the first signs of one created mechanically by Frankenpump. (just running another batch at the moment and I think the combination of Frankenpump and convoluted pipework are showing rather good benefits ... if my thoughts are correct, I'll put up another thread).
Don't worry about making the bio acidic. To the best of my limited knowledge, if you wash and dry thouroughly after an acid wash (or splitting an emulsion), it's not possible for any of the acid you added to remain.
The only realistic action you have is to carry on washing and test it. Posting your results would be of great interest.
