How is the pedal? can you hit the floor with it? get better on the second pump? or is it hard and just not enough pressure. With the smaller mc and more pedal ratio you should have more pressure unless you don't have enough stroke (fluid vol.) The only way to fix that is back to a bigger bore or lessen your pedal ratio. A residual press vavle might help if it gets better on the second pump.
Cheap Thrills Off Road
2003 F-250 4X4 7.3 PSD Crew Cab