Wait, you don't like crowds but fish Valley 😉 I used to be a Valley regular and stopped fishing it, besides a winter trip or two, because of the crowds.
I concur that if you expand your reach 15-20 more minutes north and west, you can expand your fishing and your skills with different fish and different types of water. You can bring those skills back to Valley and catch more because of the experiences elsewhere. Even stockies can teach you some things and not all stocked cricks are alike.
The best way to have success on Valley (besides fishing after the rain, which is "cheating" and makes everyone a pro there 🙂) is to avoid lining fish while fishing upstream. A long leader, even a mono rig, with one nymph that does not make a commotion when it lands is an easy way to get the monkey off your back. Fishing riffles and undercut banks, not pools, is another way.
They are not selective fish, not even that spooky where they hear and feel people all day long, but they will spook with bad presentations. Concentrate on the approach more than the fly, and size of the bugs more than the pattern.