I downloaded the free version of the app on my V60. Here's a few calibration screenshots. I will say the first couple of calibrations had well above 12ms latency times, which may have been due to background processes running. After a minute or so, it seemed to settle in around these ranges. Not sure if you'll want to actually seek out this phone, but it's another sample point for your consideration.
If anyone else wants to help out, here's the free version. You can find the calibration option in the main settings menu.
https://play.google.com/store/apps/details?id=com.ntrack.studio.demoView attachment 338869View attachment 338870View attachment 338871