You should be fine if you use that brake fluid. I flush my supra with Motul RBF 660 twice a year and I dd the car with 2-3 track days a year - no issues. FCPeuro has a lifetime warranty for fluids and parts.
You summed up what I experienced with the ECS02. I never used the first version of that tire or PS4S. The ECS02 is on my 2nd set of wheels, square setup 275/40/18 that I use daily in the summer and track duty (2-3 track days a year) so far no complaints. I drove them in pouring rain during my...
I wonder if this is related to the software version the 2023-2024 are on. I only did the brake recall on my 2020 and I haven't gone to the dealership to get it to the latest software version or DIY.
I have you know that @Rensuhlo is literally the CEO of the largest tuning company on the globe for MT MKV Supra and has worked in this industry including time as a BMW-M technician since the year 1999.
All he does all day, every day is tune engines.