Hi Josh
there are very few suituations where I find that the air flow line won't preform. At that point you could use split shot above the fly. You might be fishing pretty heavy water. I think it is the best thing going, and having the versatility of a multi tip line.It is the best casting line availiable. I fish the same rivers that you mentond and have always found it ok. You could also use weighted flys in heavey water runs also. Every body has there own way on things and this is my veiw. I hope it helps.