Kyle, thanks for sharing, very informative!
The benefit of WDR in this case is to get a better view of the display cases
In our testing, WDR generally delivers its maximum benefit when the variation of light is extreme and there is a single bright/ hot area, like so:
In your case, the light variance is nowhere near as extreme and is alternating. So I do not think anyone's WDR would help much there.
I am not sure what settings, beyond WDR, will make the most difference, but I have shared this with Vivotek and we will promote the discussion to get more ideas.
The reply of Undisclosed 1 is correct about the exposure time of WDR pro. Since from the pictures you provided, it's a scene with a lot of white objects, which would make the exposure time even shorter, and make the overall exposure level lower as well. To improve the flicker issue, I would suggest two ways, either of them should help based on auto exposure theory.
1. Increase the exposure level. That will longer the exposure time.
2. Change the exposure measure windows from full view (majorly white scene) to a smaller windows which covers a relatively gray area (e.g. the down-right side of view).
I hope my suggestion helps. Thank you for adopting VIVOTEK products.