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@gbj_tester
Clubman confesses to 'mechanical doping'; perhaps not up there with Armstrong on Oprah for media attention, but more surprising.
46/17 is worth a try too, but the most important thing is to be be sure that your roll-out is under 18'10.2" before you get to the gear check. Each 1mm of change in the section height of your tyre is about ⅝" change in roll-out, so if you're trying to nail that sweet-spot between 71" and over-geared, tread thickness makes a material difference between tyres of the same casing width.