skizriz, Did you use the stock YJ shackles? or conversion ones. did you use a conversion hanger?
I'm curious what the total height gained from the SHACKLE set up is. THAT will tell us how much "flatter" and "lower" the YJ springs are.
Side note: I also wonder if the real reason that YJ springs flex more isn't that they are "softer" but that they use a longer shackle to allow for a greater amount of easier flex, allowing the spring to compress more fully (not necessarily the whole picture but a lot of it). A NO-NO on a CJ as many peeps will say, "stay away from a shackle lift", but when they convert to YJ springs, that is just what they are doing.