Alex, I know you live in Tahoe, but I would still run the same pad in the winter as you run at AutoX. Track pads actually aren't very good for AutoX since they don't work too well when cold.
The R4-S's may not be best since, on 9*F mornings this winter, they would be a little slippery on the first stop. No biggie as long as you are ready for it though.
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Slow and low, that is the tempo.
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