The back is actually pretty low due to worn out leaves. I matched the front to look good with the back...does the front end lose caster as it is lowered? Is it possible to raise the front and gain back some caster?

Sidenote: I can't measure ride height by checking heights on the LCA due to my wheels. So I set it with about 1" between the bump stop and the frame. I currently am using stock 318 torsion bars and stock bump stops. For stock bars, do I need more clearance between the stop and frame?