The amount of fog was more of a surprise than anything else, due to it not existing for the developer bleach/fix. It is my understanding that there should be no silver left to develop on the leaders at the 2nd dev stage.
I have working processes, even for the film at hand (TMY here). What I have been doing is working out a more systematic approach, attempting to get the most out of any film. To do that I need to be able to explain any surprises along the way, with work around to suit.
I did not mention the amount of silver solvent or the film as they were not important or required to answer the question. I am looking for a more generic answer.