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I had the same issue with my BSR in Vegas last year. I was convinced it was a fuel problem and went through the same checks that you did. Relays, check pressure, even changed out the fuel pump and nothing changed.
It didn't want to start when hot, and the idle was inconsistent at times. But when it got running I didn't notice any problems out on track.
Eventually I found an air leak at the oil filler neck, and had a mass air sensor going bad. I changed the neck and the airflow sensor and none of the symptoms have returned.
Wish I could help you further...Good luck!
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