Cool pics, Whisperer.

Pinner, from my limited experience, how the dries sit in the water doesn't really seem to affect how the trout respond although you'd think it would.

On the most basic level of trying to determine what is hatching at night, mayflies are usually really obvious as they tend to be VERY delicate when they fly and you can usually make out their lengthy tails when looking at them. Caddis look like small moths and fly like they are drunk... they bound around in the air and smack the water as they lay eggs. This time of year, I'd think that chronomids would be the ticket... or those damsels.

As far as finding rocks in fish, it seems to be fairly common. I always assumed they just accidently picked up the rocks while slurping something off of the bottom. The one in that pic looks like it would have taken some effort to make it out of the "exit" door.