CJ,
I think I might know what you are alluding to.
I quitted using Fomapan films (400 & 100) because they are prone to, what I tend to call, 'mechanical pressure fog'.
This is a kind of 'damage' due to some kind of 'intensive' contact between the camera reels film-transport causing friction between the backing-paper or film fingernails and all alike, and the emulsion.
I was 'shooting' a lot of Foma 400 in my Hasselblad, and among the 5 film-baks I have, 4 of them were causing this kind of damage more or less looking like intensive streaks and lines, as well as over the image area as on the film-borders (= a lesser problem). Just to be sure, I had one of these backs adjusted to the rather 'thicker' Fomafilm, which did not entirely solved the problem.
I did not test it in an other camera, as I planned to use this film in this camera for a particular project.
Strangely, the same kind of 'streaks', but on an other area of the film, appeared when using the JOBO 2500 system reels. I solved that by working on SS reels.
I noticed that these problems could be caused before developing and looked like 'exposed' as no physical traces were found on the emulsion nor the back side of the film. This is why I tend to call it fog.
Surprisingly enough, this phenomenon was less intense when using more 'classic' developers like Rodinal, I mainly process in Pyro-HD, but these lines were still present even when using the Jobo reels. Why, I do not know (and do not care anymore).
At the end, I had to send some of the developed films showing this phenomenon to Foma Bohemia. As an answer they mailed, along whit their excuses, 10 rolls of fresh film, but no explanation nor a solution for the problem.
As I realised that physical contact due to the systems involved could not entirely be avoided, I decided to leave the Fomapan films and move to Kodak's TRI-X 400, what definitely solved all problems.
I find it a petty because I do like the look of the Foma Bohemia emulsion as it was close to the beloved and 'vanished' APX-400. But, one has to be open to changings, once in a time, and I settled now with TRI-X...
I do hope that this is an answer to your troubles.
Good luck,
Philippe