The Meiser 12’6” 5/6 rod I have mentioned will handle 13-15 lb fish if needed, but I would not recommend it for 15 lb fish.
Fishing with this rod rod over many weeks in West-Central Alaska I had an occasional hook-ups of Kings…, which as expected required braking a tippets. However, I have landed successfully in August stray silvers in 12-13lb . Fortunately by the first week of August most of larger Rainbows quit competing with Dollies and Arctic Chars for salmon eggs and will concentrate on salmon flesh, which usually collects in places away from spawning salmons.
If you are looking for a bit stronger rod, Burkheimer 12’5” 6/7/8 which is more of wt. 6/7 could be a ticket.
CND Spey Tracker, 12'2" 5/6 is another option. This rod is slightly stronger then the Bob Trouter.
Salmo