low / soft brake pedal

[portworks]

68 swb, captain fab short booster bracket, s10 booster,73 corvette dual disc master cyl. Stock distribution block ,original style one into two front and rear lines. 9" ford disc rear end, and 1985 front disc.
I am aware of how to bleed properly with a stock distribution block and have pressure, vacuum, and manual bled.double and triple checked push rod lengths.
Any other ideas I'm missing ??? Possible ratio problem from removing stock under dash brake leverage arm/ bracket assy and hooking pedal directly to booster ?