Would perhaps be a good idea to clearly split Foma and Arista threads.
I've been using Foma film for the past years and I've experienced none of the issues Arista users report when they're actually using Arista, leading me to suspect that, if Arista is (or has been at some point) Foma, it's probably old stock or b-stock Foma sold cheaper to the American market for a reason.
Indeed, it's impossible to track down Arista batch numbers as it doesn't track Foma's numbering.
If you can choose - pick the real deal, and in case of any issue file a report to the manufacturer indicating the batch number.
Just like Ilford with the famous backing paper mottling issue, Foma is very quick to reply and replace any rolls found to be problematic.