Question for the trout bums...

How do you guys change up your tactics when the targetted trout are predominantly browns and brookies as opposed to rainbows?   I'm talking everything from fly selection to presentation, to places they hold.  The weekend after next, I'll be fishing in an area known to hold more browns and brookies than rainbows, and I've noticed that techniques that I can usually get bows to go for got absolutely no reaction from the browns I've fished to.  The two brookies I've caught on the fly were pretty aggressive, and I didnt see either one prior to the strike, as I was fishing to a spot rather than to a fish.

Any suggestions?

once again I completely disagree with flyfishermanPA

it all depends on what type of water and what type of population you are fishing
For PA (and from what it sounds like you are going to fish)... you are most likely hitting pellet head bows, hold over/wild browns, and native/wild bookies

where are you fishing? (you can PM as not to "spot burn")
any bugs?
what type of water? large pools? riffle run? pocket water? limestone? tailwater?


IN GENERAL
larger browns on larger water turn to nocturnal feeders and are more aggressive to take meat patterns
brookies are more likely going to be in smaller faster moving water, they will be smallar fish and will smack hi-floating dries

cold,
 
I don't change tactics with changing trout species.  A dead drift of an appropriately sized (for that stream) bug or a stripped streamer is going to get the same response whether it is a brown trout or rainbow.  On any given stream you'll have a certain set of lies that fish will hold in.  For the most part in PA, you're dealing with stocked fish in freestone streams.  There isn't much difference between any two freestone streams or any two stocked trout.
 
That said, I do vary a little bit in where I look for the trout depending on the stream.  If it is a sandy bottomed stream primarily and I find some rock, I'll focus on that.  If it is a muddy stream, there are normally trees and undercut roots/banks to focus on.  Rocky streams I concentrate on deeper flowing water and finding pockets.  Incidentally, it seems that in PA the fish will be stocked in partcular types of streams.  Brookies are the least hearty and will be in colder forested streams that tend to have trees and rocks.  Browns and bows will often be put into lower quality streams that don't have those features.  Changing tactics just happens to coincide with the type of stream and the fish that were stocked there.
 
I also change tactics when I'm fishing for stream bred browns and brookies, but only because I like fishing certain tactics on those streams.
 
Thanks,
Rick