SSBC disc brakes won't stop

Ill have to check that out. I switched to the smaller diameter mc because I only had 500-600 psi on the front calipers with hard pedal pressure. Was told small 7/8 mc would supply more pressure and would only have slightly more pedal travel. Probably going to check the pressure with the 7/8 mc tomorrow to see if increased at all.
So if Im hearing you right your saying just open up the rear line and then see if the front are stopping the car? Then when fronts are 100% reconnect the back and bleed the rears?