I would use the Achilles 123 over the Shitty RSR's, they are on the back of the 31 at the moment ( track spec version).
Grip is good just don't think they will take the heat cycles or lower pressures like the AD08's
Was a good day out,
I Know which club days i would attend in the future......
Tony how did you go in the last session after another 30 minute recovery?
I went 3 seconds fast than last time which is a bonus but still miles off "teens"