Get the sag right then worry about the valving. It does sound like your valving is way to stiff but get the springs right first. My car with the beam was about 800 on the front and I ran a 100/150 10" each. I had 4" over Tweed arms. If you have shorter arms you will need even less spring. Valving doesn't hold the car up springs so. Valving slows done the movement of the spring only You should have 25-40% sag from full extension to ride/static height. The rear of my car was about 1250 and I ran 250/350 on the springs but that will depend on the mounting points of the shock. Fox and King are really good at getting you in the ballpark spring wise. They will need measurements of shock angle and dimensions of pivot to shock mounting points as well as corner weights but they are a great help.