Just saw your PM...I did look up low drag calipers...from what I read on the internet I don't think they are. I still need to contact the right stuff and ask them. The fronts are metric also. I didn't make Pomona...bro in law came out and had tickets to the Humana Challenge golf tournament. Thank for all your help with this.
Since you said the brakes were never great and what was said you did. I leaned toward you having low drag calipers on the front. (Which you don't want) it's hard to tell them with the wrong master from air in the system to not enough volume.
But I think you got a better handle of it. One test at a time from the pedal out to the wheel. I think/hope youll have a good pedal with both connected and again with just the rears connected. Look up low drag all low drag calipers are metric stlye but all metric style are not low drag.