I think pressure may be part of it, but it’s also the nature of the stream. Streams in that area of similar size to Slate (I’ll call them on the bigger end of small) are generally mostly wild Browns, especially in their lower reaches. Freestone wild Brown streams are generally very difficult to fish outside of higher water, or very early in the AM, or late in the evening. I’ve fished many of those streams up there that I’m sure we’re all thinking about that are similarly sized to Slate, and they all tend to fish pretty slow outside of relatively warm weather higher water events. Yeah, I think Slate probably gets fished more than most of them, but on the same given day in the same less than ideal conditions I doubt many of the others would fish much better, pressured or not. If I’m heading up there to fish one of them, I try to time it after a Summer’s rain, for the best fishing. Sometimes I just want to fish/hike/camp and I don't care, but if I want to catch fish...conditions trump all.
Once you get further upstream on these types of streams where you tend to begin to run into more of a 50/50 mix of Browns with Brookies, the fishing generally begins to improve when talking about less than ideal conditions…you start to catch the Brookies at least. Survey data on Slate, and many of those other streams confirms there are significant Class A populations of Trout in them…you just don’t always catch them, especially the Browns.