I concur with Fichy..
An 11' is not necessary..My long rods sit idle..
I have a 10' sage 7#.. my fave steel fly but not salmon.. I thought about another pole like an 11' switch.. WHY ?
At this point my rods work.. Most fly for me is in close be it indi or dead drift.. In spring when flows ar more the 8# ,
9-6" works well for swing and serves salmon too for fall, question again for me is why do I need another.. They both work well..