Plugin version - 1.0.18009.1100
Enscape version - 22.214.171.1248-ge5bc706
Seems like Atmosphere tab's "White Background" changes overall brightness of the image.
This has been observed both "auto contrast" on or off (which I thought was the culprit)
**Unticking auto exposure seems to solve the problem.
Stupid of me to not see the obvious.