Front disc coversion problems

Finally drove my Demon around the block after installing a manual front disc conversion and found 2 problems. Hope you guys can help me out a bit!

I installed a brand new disc/drum master cyl and also a disc/drum distribution block. Thought all would be fine. Apparrantly I'm wrong.

Problem 1. Pedal feels a bit spongy....at least to me. I heard I should have a nice hard pedal. Bench bled the master cyl and bleed my brand new lines,, twice. Still feels a bit spongy.

Problem 2. Rear brakes locking up with moderate braking. Darnit, I thought the new master cyl and distribution block would create the right pressure, front and rear. Do I need an adjustable proportioning block for the rear line?

Maaan, this thing's been "under restoration" since October and I really need to get on the road! Driving to alignment shop Monday one way or another...