Browns feed best in the early morning and evenings, especially larger ones. You can still have decent action throughout the day for brownies if you over them.
Another thing is I have never found belief of browns to be smarter than other trout to be true. All big trout are smarter than smaller ones. But in general, trout are aggressive predators, and browns, especially smaller ones, can often be found in shallower water and tempted with faster presentations. Browns seem to like rocky areas that hold a lot of baitfish. Finding the baitfish is one of the best ways to find the trout.