I dont know of anything thats availible other than the setup sheets you have. This site will provide you with some solid starting info.
http://richardchang.com/hobby.php?topic=112setup
The section that deals with damper tubes applies to the lower shock.
Each has their +'s and -", imo its more of a feel thing. I've tried some link cars and just never could get comfortable with them, I started with t-bars and those just feel right for me.