Hi I find this quite an interesting take on an age old problem....three weeks ago I replaced both tyres with new cobra chrome and the tyre technician introduced me to his interpretation on tyre pressure which puts 40 in the front and 38 in the rear. His rationale was around the front doing the majority of the braking and with a heavy bike travelling at speed with the weight of a rider also in the mix the front tyre is less likely to distort with slightly more pressure in it. I must say that this set up feels better than I remember my first set of tyres did.....just a thought