I don't use swivels for trout. I don't have any line issues and I use Kast Master spoons...mostly the 1/12....1/8....and 1/4. Now having said that I know they can cause a lot of line twist on spinning gear. If I was going to use a swivel for trout it would be these.
http://www.aquateko.com/Aquateko_Inv...wivels_s/3.htm
The company sent me some samples and I did use them on the Caney and they worked fine. They are made of fluorocarbon and are extremely strong. The problem I had was the size I wanted to use were so small my old eyes couldn't see to tie them...LOL. I can highly recommend them though.
Regards