The process I usually follow on the road is to use the Berto method to get the rear tire pressure, then subtract about 10psi for the front. I don't want to use the actual weight distribution because this usually makes the front tire too soft for out of the saddle riding. Then when I notice the handling suffer a little, I reinflate to the original number plus about 5psi. With my 38mm and 42mm tires, that means adding air every 2-3 months. With really supple tires, don't loose much speed.