Try to use 10 lb weights. Troll speed should be around 2 to 2.5 MPH. if you are using dodgers. From your ball you should have about 10 to 15 ft of line out to the dodger. from the dodger to the fly should be about 18 to 24 inches.
20 pound mono line is good for downrigger trolling.
Dodgers can be chrome, yellow with red dots, orange, chrome/green. I use howie flies, colors in purple, white, green, yellow.
I also use spoons, my favorite is watermelon.
If you are using a 10# ball trolling at about 2.5 MPH you will need to compensate for the drag angle of the downrigger. Example - if you want your downrigger to be at 50ft you will need to lower it to about 60ft because of the drag on the cable and line.
Right now I have been fishing in 100+ ft of water and downriggers at about 80ft and I do very well.
I also use dipsey divers number 1 size with rings. I use both dodgers and spoons. I keep them down in about 50 to 60 ft of water. That would be around 200ft of line out on the line counter for a trolling speed of 2 to 2.5 MPH.
I use 30 pound fireline on my dipsey trolling rods.
Hope this gives tou some ideas. The best thing to do is "Just Do It"
Good Luck Fishing.