Most lake run Rainbow Trout of the Great Lakes originated from Eel River strain Steelhead of Northern California. Big bucks can get into the 30 inch plus sizes although an average sized fish would be under 30 inches. Depending on the water types you fish and the flies and lines used to deliver, you can fish anything from 9 to 10 feet in a 6 or 7 weight.
Your 9 foot 6 weight BVK should be fine for throwing streamers with a sink tip or integrated shooting head.
If you plan on nymphing, a 10 foot 6 or 7 weight is a good option. The 10 foot length would give you better line control when dealing with multiple currents and longer drifts. The line weight should depend on what you plan on delivering. If you plan on using a regular sized indicator, a modest amount of weight, and small to medium nymphs, get the 6 weight. Larger payloads would demand a 7 weight.
I have not fished a 10 foot 7 weight BVK, but in theory, it should be a good complement to your 6 weight.
Dennis
