I have 2wd calipers on the rear and AP 4 pots on the front with a standard master cylinder and the pedal is spot on.

If your car is piped up as a standard car that left the factory then you have actually blanked off a front and an opposing rear caliper. Standard cars had the passenger side of the master working the fronts and the drivers side of the master working the rears. IT IS IMPORTANT THAT IT IS PIPED UP THIS WAY!!! You will never get a good pedal unless it is piped up so that each chamber of the cylinder works 1 front and 1 rear caliper each!

I recently had an issue where I had no pedal unless you pumped it, then when you lift off it would go. Nothing but fluid would come out on bleeding them but the issue turned out to be a tiny pocket of air trapped in the rear calipers. I had to unbolt the bottom caliper slides an twist the caliper to point the nipple upwards to get rid of it.