Your CPU will be fine. You need some external IRs. The layout of the property makes it more challenging to cover. You are correct use turret cameras. A lot less problems with bugs and spider webs.
Dig the trench, its worth it. One wire is fine but two is better, you never know if you might...
If you are looking at IP cameras you can't go wrong with talking to Andy. He has a aliexpress store and is a member here. Rock solid when it comes to backing his cameras. Super fast shipping. Good prices to boot.
I have used at least a dozen different camera brands over the last 8 years. So far...
It was worth a shot.
Factory ip is: 192.168.1.108:80. If your subnet is different it might have changed during a power failure. Always use static IPs with cameras. In both Camera and router.
You are getting lots of IR reflection. Turn the IR down or you need to move the camera closer to the edge of the eve or point it down more. No need to see anything above 10 feet.
Very slick, looks good. Nice way to get below the duct.
What kind of gasket material did you use for the one outside? Looks like a black gasket of some type.
If you cant trim the plant back then yes a external IR will be your best bet. Place the IR Under the ridge line under the soffit out of the view of the camera. Or under the camera. Otherwise it will be like looking at a street light. It will bloom the picture.
BLC will help. But you really need...