When trouble shooting your brake system, remember to check volume as well as pressure.  Large master cylinders can fill small calipers faster than small master cylinders can fill large calipers.  This can lead to rear brake engagement before front brake engagement, causing a “loose corner entry” problem that’s hard to diagnose.  Your caliper pressure gauges will read correctly at full pressure, covering up the problem early in the brake cycle.  Watch your gauges and see which calipers engage first.