On those 2 samples I think you're fighting a couple of things
1- 4k/8MP camera on a too small sensor. Dont buy any more 4K PTZs
Dahua sells a bunch of crap PTZs with inadequate sensors. The only ones from their entire catalog I'd be interested in are the 4MP/ 1/1.8 sensor models.
So Basically I'm saying of the 100 or so PTZ models, I'd only buy about 5-6 of them
This one out of the entire Wizsense line
SD5A425XA-HNR,DH-SD5A425XA-HNR
www.dahuasecurity.com
The Wizmind 8 series in 4MP with the 1/1.8 sensor only
WizMind Series
www.dahuasecurity.com
This one looks interesting out of all of their X-Spans offerings
SDT8C442-4P-GA-APV-0280
www.dahuasecurity.com
2- The IR bounce from under the carport. Yes agree with your move choices
3- Light- as you flood that zone with white light floods or IR from adding external emitters things will get easier
4
- Time tweeking settings
I probably have 20-40 hours in each PTZ just messing with image settings. It cant be done in a single evening (daytime is easy)
What you have in those two samples is a start. No real motion blur, so thats good. Now its fine tuning to get rid of as much of the noise "sparklies" as possible
You have to play with each control one at a time.
Leave Exposure alone for now, play with Gain, Iris, Exp Comp, and Sharpness and Gamma on the image controls.
Go ahead and run 50 on both DNR as its not going to get a lot better or worse beyond that
5- Over reliance on PTZs vs zoomed fixed cameras
I understand the allure of PTZs but what most dont understand is that once you zoom the light sensitivity and therefore image quality goes to shit. The more you zoom, the less efficient the camera with respect to light pickup. Consider 5442 Z4's for choke points such as 2-3 for instance beside each other at that side carport location covering effectively 180 degrees with better image quality.