This is the same setup as mine. The master cylinder is a Morgan part and doesn't have a bias so the servo puts the bias to the front.

I have never had any problems with stopping, and have never had the back lock up under heavy breaking so the bias seems about right although I would agree with the road test in that the pedal travel is a bit more than would be ideal. I am currently using EBC disks and red stuff pads all round which I find are better than the M1144 and don't produce anything like the amount of brake dust I used to get with the Mintex pads.