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RBF 600 stated wet boiling point: 420f. No surprise you encountered brake fade w/ 450f caliper temps. Sounds in line with what I've heard about ST43's: they generate a lot of friction and heat. Sounds like not the ideal pad for a bullring like Autobahn (yes I've driven the track). I don't doubt JeromeS13's assertion that your're likely braking a bit too much as well.
SRF is a band-aid that will likely keep heavy brake fade at bay (517f wet boiling point), but will not address the underlying issue.
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