I chose an MC of 5/8'' for the front and 11/16'' for the rear to have a pressure on the rear circuit lower than that of the front circuit with a 50/50 adjustment and to have a slightly greater volume of liquid displaced at the rear than at the front since the pistons of the rear calipers are larger than the front ones.
For the moment I have completely ordinary pads at the rear but my rear calipers come from a Renault Mégane RS II which is a very sporty car often used in rallye and on tracks, there is a large choice of pads more efficient.
I have to receive the Porterfield pads tomorrow and I hope that it will finally stop raining so that I can do some testing on a really dry road, which I haven't been able to do yet.