K series were designed for braid. ie, wet and floppy. The reasoning being that as braid comes off of a wet fixed or multiplier spool, it can slap around the butt ring and occasionally loop around it, especially in a cross wind. This can result in a snap off or if using 6oz jerk baits, the butt ring being destroyed. The K series is meant to stop this happening.
Found this demo here
So, I would not see any advantage in using them for your rod for what you are using it for. I think they would probably work out a wee bit heavier too as the frames are bigger. Having said that, due to the angle of the ring, as your shooting line comes up off the floor, it would "possibly" come over the ring with a fraction less friction.
Like I said in the shop, Fuji have done a lot of research on ring diameter, weight and numbers and their Fuji Concept ringing, ie, more rings of a smaller diameter and lighter weight, has been shown to allow line to flow more smoothly and thus casts go further.
Its all about getting loose line under control very quickly, and keeping it off the blank. They found line slap against the blank could reduce a cast by 25% distance. Here is some high speed footage, the line does not touch the blank at all.
Naturally you do not have the coning issue of a fixed spool reel, but, the principle for the rest of the rings still stands.
Also, and this is the bit I find more interesting, Fuji found that the more rings, and therefore the closer the line follows the curve of the blank, more "power" can be transmitted to the cast/strike. They are talking of a 10-15% increase on a spinning rod.
Presumably, that would also translate to a fly rod, possibly not with such a gain as a fly rod already has more rings following the curve of the blank. Where snake rings fail in this concept, is that the line touches the blank, especially on the forward cast and shoot.
Eliminate that line touching and I believe you will get several yards more shoot.
