Camera Doesn't Detect Motion

My camera is on a 2nd story, looking out over the porch and into the street running parallel to the camera and driveway facing perpendicular to the camera.  It fails to detect anything driving down the street.  Maybe one car of ten or more the last two days.  It sees a fly on the lens, but nothing else, including a FedEx truck going down my street, stopping in the center of the frame, and the man walking up to the house; today at least four garbage trucks driving by and multiple ones stopping to tip wheelie bins in the center of the image; and did not see several visitors to the house who drove down the road and pulled into my driveway, stopping in view of the camera.  

I have the shutter set to open in all three modes, the camera is about eight feet from my wireless AP in the same room, indoors (camera looks through a window).  I have tried changing the sensitivity from medium to high, no effect.  It's only detected maybe one vehicle in three days.

It DOES record a minute of video for each alarm activity, and works in live mode, but that's about it.

I'm including a link to a photo album showing my camera settings, the time it detected a vehicle, before I repositioned the camera to be more useful, and images showing the repositioned camera viewing the street/driveway, and one with a car in the driveway, none of which trigger the motion sensor, aside from the one time the pickup drove at the bottom of the image.

https://imgur.com/a/idemfep