For Single handed Spey the Wulff Ambush line is very popular with some Versi/Poly leaders.
http://royalwulff.com/products/ambush-fly-line/
https://www.youtube.com/watch?v=ROWYZPaiNd4
I am sure some of the other lines will work as well.
I would talk with Jeff Putnam about getting the right line for single handed Spey casting for your fly rod.
Our most popular video has been Jeff's "Single-Handed Fly Rod Casting Using Spey Casting Techniques".
Jeff really likes the RIO Grand, two sizes heavier than the rod for single handed Spey casting.
https://www.youtube.com/watch?v=EsPg45iNd_U
*I would love to try this on the Trinity River in Oct/Nov for swinging wet flies for Steelhead.
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