Works well for me too. Can you share your settings in more details, there are quite a lot of them and if you have tried to get an optimal combination already it would be appreciated.
The camera config one is a major one. This setting affects the way the application interfaces with your phone's hardware.
If you use Nexus 6p config, for example, you'll get more moderate shutter speeds compared to Pixel 2 XL, at both ends of the spectrum.
In other words, if you want your shutter to run with the fastest or slowest speeds (determined by lighting conditions by default), you should select Pixel 2XL.
If you shoot in pitch black, which I did to test the 'purple tint' noise issue, you'll see that the Nexus 6p config shutter speed will only drop to about 1/10 on the Moto X4. That allows for less amplification effects, which reduces the 'purple tint', but also affects the dynamic range and data collected at the sensor.
If you shoot with the Pixel 2XL config, you'll notice the slowest speed the shutter auto-generates is 1/6, compared to the 1/10 of the Nexus 6p. Thats even slower, and you'll likely see more 'purple tint' in low light scenarios due to more data (probably too much at that speed) hitting the sensor and seemingly overloading the pixels with bad data, in a sense. That along with the amplification of the data collected is what has the biggest effect on purple tint with the Moto X4.
You'll notice the opposite effect if you test in bright light. The Pixel 2XL config lets the shutter reach faster speeds, compared to the Nexus 6p config, for example, which won't snap the shutter as fast.
Overall, it's mostly acceptable with HDR+ Enhanced on, which is the only mode you'll get a 'purple tint', if at all.
During daylight, outdoors, there's very little shutter lag, even with HDR+ Enhanced, by the way. The lower the light levels, the longer the HDR+ processing takes.
From the beginning:
Camera config: 2017 ZSL HDR+
Model: Pixel 2XL
HDR Parameters: Super High
Advanced:
HDR+ Control: ON (for access to HDR+ Enhanced mode
USE ZSL / Remove Pinkish/Reddish : ON, ON
Developer Settings:
camera.use_photos: ON
camera.diet_burst: ON
camcorder.fastswitch: ON
camera:gcam_enabled: ON
cameraprogress_overlay: ON
camera.enable_pd: ON
camera.enable_pd_blur: ON
camera.enable_hwhdr: ON
camera.enable_vesper: ON
camera.gouda.front: ON
camera.gouda_sec_img: ON
camera.p3: ON
camera.raisr: ON
Any developer flag not mentioned is left OFF. I only included a combination of the ones I found give the best effect and function; they're the only ones enabled.