Sorry Dave, I've never really been clear how different pot values interact - I mean obviously the total resistance of the circuit is different, but what effect that has on the tone I have no idea.
I remember at one point DiMarzio would recommend a 500k volume and 250k tone, then later they switched to 250k volume and 1meg tone... I have a general impression that the value of the volume is more crucial than the value of the tone, but not sure why that should be the case (if indeed it is).
Of course the real answer is "EXPERIMENT!"
....but......... (you'll be unsurprised to hear) I really can't be bothered.