Trolling Spoons Question?

I am switching over from pulling harnesses to Michigan Scorpion spoons next week. This will be new to me and need some help. I need to know how you are attaching the spoon to your leaders. Snap swivel or Duo lock? I will be using boards and jets or dipseys. Also what is best speed to pull the spoons. Any help would greatly be appreciated.

I just use a snap swivel... speed depends on the fish.. over the last weekend we totally crushed the fish at 1.9 to 2.3 mph.. pink and purple were the best..