I set my spoons up like this...

Split ring on each eyelit of the spoon. 2/0 or 3/0 siwash off the trailing split ring (no swivel), and a barrel swivel off the top split ring for mainline attach point. I land more with this set up than I lose. I'm not sure if there's a difference between hookup to land ratio when you run a swivel up front versus runing a swivel between the hook and rear split ring? The only difference I see would be more of a hangback on the hook which could be a good thing.