That just might be the perfect line for fishing the Miramichi and Cains rivers in New Brunswick for salmon in the fall. Both rivers I fish an intermedit tip because they are shallow in the fall. Do you find they are matched to the rod weight ie. 8wt line to an 8wt single handed rod? Or do you need to go one line heavier?
Yes, those are rated for single-hand rods, as advertised. But you may want to try one weight up. If it is Simon Gawesworth that worked on the weight recommendations then we already know he like things on the lighter side.
So the 8wt would be good on a 7 or 8wt rod depending on taste. If you look at the actual weights they are already a good bit more than you would expect an regular overhead line to weigh for a specified weight, and that is intentional. It’s kind of a balance for the individual what weight will feel best, and I like to imagine that depends on where you want to balance things percentage wise between overhead and spey casts - more spey cast, then maybe prefer a bit heavier. The heads I believe are about 33’ so that is already pretty long if you are thinking about spey casting with a 9’ rod. Also it goes without saying that these are not designed to drive really big flies. In such cases you would probably want a (possibly) shorter, traditional shooting head with a less stretched out taper. Those can be spey cast as well, and when they a short enough they are basically, I suppose, a skagit head.
Are there lines that might be a little easier to do spey casts with on your SH rod right out of the box? Probably. The SH Spey is more the ideal line of someone that wants to work some spey casts into the mix. I like to think of this line as the prefect line to learn all the tricks Simon Gawesworth talks about in his single hand spey casting book, which is total integration of all the possibilities using a single hand rod. Those possibilities include not only everything you can do with a two-handed spey cast but everything you can do incorporating an active line hand. So the number of possibilities squared!
Note: I think it would be fair to add here my experience is with trout, not Salmon, with these setups. So far my use of the SH Spey lines has been 5 and 6 wt lines on a 9’ 5 wt Burkie DAL, and one of Steve Godshall’s custom rods, a 9’ 7” 6wt that has a very similar action to the DAL.
Hope all this is slightly helpful.