Bob Meiser's well know 11'7 67 is available in additional line weights, even though they are not listed on his site. I am certain there is an 8 in the line up. They are a smooth, powerful, progressive action, and talking with Bob I'm sure you could determine the line to get the feel you want.
Burkheimer's 7117 is a sweet rod as well, maybe a little lighter than you're talking, but deep loading, smooth casting and very accurate.
The Prospector switch and the spey rods probably have a different feel to them and that the spey rod wasn't designed to overhead cast whereas Redington probably designed the switch to accommodate overhead casting which the Prospector does well.
With most lines at the top of it's grain rating, my 8110 Z Axis feels pretty full flexing, but I would second the TFO DC series. My buddy has the 7110 DC and it is pretty sweet with a Nextcast FF35; loads deep into the rod and is plenty accurate. If you can wait until January I would look at the Echo Glass double hand series. I know I will be looking at that 7129.
I fished a Scott L2H 1158 for a couple weeks on the Bulkley this year with a 550 Skagit max short. I thought the 550 was slightly heavy for it but the combo was my favorite for that river this year. Full flexing, easy to cast and great power to turn fish.
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