My experience with two baths devs is almost only with the above Diafine lke formula.
From all I've read, it is mandatory that sol A is neutral to acidic to get the 'two baths' effects.
My conclusions from the above:

- There is no significant speed gain (with TX, almost zero).
- Its very compensating, so it is good at taming highlights as in night strret photos or flash.

I use it with TX @1250.

I will be posting a couple of night photos in the technical gallery.

Jorge O