Here is the manual for the spring assist install:
http://ccmanuals.info/pdf/NF%20Spring%20Assist.pdf
And here is the one for the 3 point:
http://ccmanuals.info/pdf/NF%203%20PT.pdf
I'm not really sure why one side of the rock shaft is lifting higher than the other, but its possible something isn't hooked up exactly right with the spring assist, or something is binding on it.
Jeff (teet)