Regarding brake fluid - I ran ATE SuperBlue in my CMC car for approximately ~8+ years. This was on a ~3175lb car (with driver, as it came off track, so heavier at the start of a race), initially using SN95 Cobra brakes (first 12" rotors w/2p PBRs, then 13" rotors w/2p PBRs), then moving to a proper race-brake setup (StopTech 13" floating rotors and 4p calipers), all with brake ducting in place.
Once I moved to ATE, I never had an issue with boiling brake fluid, unlike some of my competitors. I raced some very brake intensive tracks across the US (TWS, BMP, RoadATL, Mid-O, LSIR, and many others). I can recall driving various competitors deeper and deeper into braking sections, and eventually they'd have to concede as they'd have an issue. Many used Motul, and the Motorcraft DOT3, and had fluid issues - they would have to bleed their brakes over the course of a race weekend, sometimes, more than once.
ATE does not offer the SuperBlue here in the US any longer due to a rather silly DOT requirement for amber or clear fluid only, but their "Gold" is the same formulation. I would race an entire season, and not have to bleed the brakes unless I opened up the system. Prior to the start of a new season, I would R&R all 5 brake lines, then flush the entire system. When I was in TX, I had a shop-based track test the fluid for moisture a few times a year, and it always tested clean.
A 1L can runs right around ~$20, usually less.
Granted, my CMC car was ~700-800 pounds lighter than an S197 or S550, so that is a consideration.
As my Boss continues to see more track usage, it will get ATE on it's next fluid replacement.