I see that the longer shackles increase caster and your web page lists this a "feature". How does this play with the shims I have in there that came with my Rancho lift kit? I'm kinda confused because on the one hand, Rancho purposely made caster worse to fix pinion angle with the lift, and on the other more caster is better for steering. If I get the longer shackles, what's the best advice? Leave the shims and then increase the caster with the shackles? Or take the shims out too and go all out for good caster for steering?