I don't generally us any weight when trolling cranks off the back .... Just choose one that runs the depth you want ..... and control that some more by the amount of line out. I generally go 1.8 to 2.0 .... sometimes a little faster. Seems like you pick up a higher percentage of white bass the faster you go.
There is a REALLY long thread on the Mississippi forum that will keep you busy reading for a while. I think it's up to 122 pages or so.... http://www.crappie.com/crappie/missi...-cranks-101-a/
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Looking for the one that makes it all worthwhile.