Thinking of building a 10' 4 weight out of a IM6 blank, I would be using it to nymph fish some of the rivers in Montana, the Madison, Missouri ,Beaverhead etc. Also using it to fish out of a pontoon boat, I fish stillwater more then I fish the rivers, but would like to use it for both. Am I headed in the right direction wanting to use this rod for these applications, or is it a little light for the rivers in questions. I am not too concerned about it out of a pontoon boat, having a little longer rod to cast with seems to be advantage out of a pontoon. Thanks for any insight on this.