For multiple jerk lines, try using 3 way swivels. Don't know if you can get away with it but experiment with lighter line on your decoys. The lighter the line, the more the decoys will move in light wind. I have some old Flambeau life size water keel mallards that have 20# mono and 2 oz weights that I use on small, protected ponds. Tying off decoys somewhere toward the middle of the keel will give you good motion in current but don't tie off dead center. That will only allow the decoy to turn sideways and lay over on it's side in good current.