The depth that you are fishing determines how much weight to use, Spring fishing I use 10 lb pancakes with the tails bent out on my out & down riggers, & fish shaped 12lb weights on the rear riggers, typically not fishing deeper than 100'. In the fall, I use 16lb Atomic weights because I will be fishing deeper than 100', I have 20lb sharks, if I want to go really deep, or the current is heavy.
Good Luck!
John