Add "PX" to EXIF software tag to help differentiate Mod PX photos
Turn on HDR + Enhanced on Pixel 4 (turn on in Settings > Advanced)
Add manual exposure slider that will be hidden when appropriate. You should enable the slider under Mod PX Settings > Manual Exposure Control near the bottom. You must use Night Vision, Portrait Mode (with PX Mod Settings > Portrait HDR + Enhanced) or Camera Mode (use HDR + Enhanced)