Followup to original post--I got a high-quality digital caliper and measured my rotors the other day. After two sets of the Street Performance pads and 8-10 track days, the wear is less than I would have expected. Front rotors are around 34.3mm (35mm new) and rears are around 31.7mm (32mm new). So I'll keep these rotors for now and measure thickness periodically this season with the new Pagid pads. I called StopTech and they confirmed that this is fine.
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