Yes, I agree, 8 -10 pound fish are rare in the Bow. In over 30 years fishing it I can only be certain that 4 fish that I hooked would fall in that category. All were hooked on size 16 drys or nymphs, all jumped so I got a look at them, and all straightened the hook after a fairly lengthy fight.
My best fish landed in the Bow was a 26 inch Brown. I figured him for 6 pounds, tops. Over the decades I have caught a number of trout in the 23-25 inch range both in the Bow and elsewhere. I know when I have something much bigger on.
There is an amazing feeling of helplessness, a complete "Oh S***! What do I do now?" feeling. Pretty amazing. I hope to have it again sometime and maybe this time the heavy hooks will let me get a close look at the Bow fish of a lifetime.