Compression/Rebound on shocks

[Phred]

The springs on my phaeton have been modified (including some leaves removed) to lower the car to a stance I like. The rear radius rods will hit the chassis rails when the car hits a "good" bump. I have approx 2" clearance between frame rail and radius rod. I am trying to resolve this without changing the stance too much.

While playing with the standard shocks (new ones from Brattons), it appears that the compression stroke is always very soft and the adjustment screw only stiffens or softens the rebound stroke.

Is this normal for the Model A shock?

Thanks in advance for your help.
Peace, Phred