Yeah, crows can be a challenge, that's for sure but it makes em that much more fun to hunt. Funny you should mention the camo hunting tent :) last year I bought a camo pop up blind and it works great in the back yard. My neighbors can't see into my yard but if they could they'd think I was nuts for sure,,, all dressed in camo hiding in my pop up blind.... :)
Crows hate owls so much that if you use a decoy they crows will throw a large degree of their caution to the wind so they can attack the owl.
The trick with the crows in your yard is going to be finding a sniping location where you can sight in on em without them being able to easily see you,,, or hear hear you.... Another trick is to get into your sniping position just at the crack of dawn and be ready... Crows are active all day but they love to get out at the first sign of light and find something to eat. At that time of the morning the rest of the neighborhood (human neighborhood that is) is not up and active and the lack of human activity translates into crows that are not as spooky yet.
Keep us up to date on your battle with the crows,,,, I'm enjoying your ongoing hunt very much ;)
Jeff