Last year I picked up some of these 3" pre-rigged trout worms that had a 2 hook setup embedded in the worm, frt & rear of the worm, and connected to about a 12" leader. I used a few of these on my 5wt with good results. Caught quiet a few SM bass and crappies luv'em too.
I found using a "light" cast works well so you don't throw the worm off the hook. I usually like to cast upstream and just let sink slowing and let the current take it for a while, twitching the line as the current takes it, to give the worm some up & down motion as the fish will usually take the worm on the down fall.
Using plastics on a fly rod takes a little getting use too, but it does work. Some people will even glue the worm on the hook for larger plastics.
Mike
"The charm of fishing is that it is the pursuit of that which is elusive but attainable, a perpetual series of occasions for hope" -John Buchan