three link upper link question

[lobudget]

I'm building a parallel 3 link for a FFR roadster (not their kit three link) and don't know the which is more important, increasing the upper link length for a better upper/lower ratio or keeping the upper link closer to the axle centerline. Right now I'm at 23" ish lowers and 17" upper (with 7 degree forward down angel) attaching five inches behind the axle centerline.


There is room to keep lengthening the upper if it goes further behind the axle. Would an 18" upper mounted 6" behind the axle be an improvement over a shorter link closer to axle center line? I could even fit an equal length upper but it would be 11" behind the axle centerline.