Most of the winter run fish on the American run 6-10# with the rare 15+, so a 6 definitely isn’t too heavy. I fish a 13’ 6 wt Meiser with an intermediate skandi and poly leaders, which covers most everything but the highest flows. There are plenty of guys throwing skagits and heavy heads, but that always seemed a better snagging setup to me. I mostly fish downstream of El Manto, which means fewer but better condition fish and fewer fishermen, so maybe that’s part of it too.