Excellent work! Especially considering you did these with an MF lens (You did mention the Tam 180, and I assumed the SP180 f2.5).
I was wondering if setting the SR at 100mm was accidental, or is this a trade secret for using SR with panning, or maybe you just had SR off for these and the lens just shows up from the last SR setting.
Anyway, I'm looking forward to seeing more from the race. I know you'll have fun.