After lots of research, I finally found a solution, but its temporary.
Download & Install ScreenDimmer (Dims Notification Too) By Etsang From Play Store.
Keep the auto brightness off, and device brightness @100% (Or Above 50%), install app, give permissions and change brightness from app according to your usage, thats it.
I think red tint is a software bug, not a hardware, because at last the motive is to decrease the brightness (dim the display) without red tint. App is also doing the same. The only difference is it has no red tint.
