Re: RS2 Sizing/ how to fish
I would say a 16 in all likelihood to big. I can't say for sure based on where you live. I can only speak for where I fish. I typically will carry a few in size 18 but the majority are size 20-24. Some guys here in Colorado fish them in 26 & 28. For me to fish them that small if would have to tie them to tippet at home or I would spend my day cussing up a storm dropping flies in the river as I unsuccessfully attempt to tie them on.
I usually fish an RS2 on the surface when I see fish feeding and breaking the surface but not quite sipping dries. I do carry some wire ribbed RS2 for getting down under the film a few inches. I also have some very small bead head RS2's.
Back to your original question 99.9% of the time I fish a size 20 either behind a BWO dry, or on its own just below the surface.
***Why Flyfishing over golf ? You cant take your phone in the river***