Well to be fair, the stock camera is very underrated and sometimes takes better pictures than the Pixel (GCam) Camera.
I am running OP6 on the open beta 8, works fine for me.
Here are my settings. I use HDR+ for quick snapshots and HDR+ enhanced for best quality.
Google libs by the way
All settings screenshots + low light sample (Stock, HDR+ enhanced, NightSight...
I don't think uninstalling the reader breaks the dialer/phone app. Try rooting your device and download the app "Link2SD" from the PlayStore. You can freeze (deactivate) apps with this, here is what i have deactivated:
Tested 1.3 a bit.
HDR enhanced is still too dark in low light, when using TinNeun+IDan with +0.2 exposure it's better.
Here is a comparison of stock, HDR enhanced and night sight (both on 1.3)
The brightest is night sight, the darkest is HD...
Did you have the chance to also test it in good lighting / daylight? If not, be prepared for issues.
Normal daylight and well lit indoor shots were perfectly fine, no crashes. Have not had the chance to test it in very good/bright outdoor scenari...