Possibly St Aidan or Salmon 1. The latter would mostly likely balance you spey rod better. Of course the former is not a marquis. I know the salmon 2 is still a bit o overkill on my 7 and 8 wt speys, but NOT over weight.
The Salmon 1 might be fine, but I fish similar size rods with my Salmon 2. I think you will appreciate it with the longer head of the Aero. I use it on my 6.5 Dec Hogan and it keeps the tip up about right.
Not sure of weight, but I used a 2 on my Beulah Platinum 7 weight and that was a very light rod. I keep the #1 for my switch or trout Speys.
Oddly I thought my salmon 2 would be to big for my ACR 13'8 6wt but it balances it nicely I would try that over the salmon 1.
I did try cast my ACR with an Orvis Mach IV and just didn't feel right, to light at the bottom. But the Mach IV did do well on my Scott 1206.
I was also casting a CND 5/6 at the time the extra weight down on the bottom made it cast allot easier.
The reels are all lightweight enough that it doesn't seem to matter all that much. I use a 2 on my 7132 Platinum, but the 3 doesn't feel too bad on it either. I don't currently have a 1 (my mistake), but when I did the 1 and 2 were almost interchangeable. I use a St Aiden on a 11'9" 6 wt and a 1 would work as well.
I wouldn't put a 3 on the Onyx, but I could flip a coin and be happy with either the 1 or 2.
I use the marquis 2 on 7136 and it balances wonderfully, also like it on my 8110. I think the 2 would be great for your onyx, 13'+ is a lot of graphite and needs quite a bit of weight to truly be balanced. I use the marquis 1 on my 5126 and it balances good too, but marquis 1 on a rod any bigger would be pretty darn light. Lead core, sure it would work, but with that said why not just get 2?
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