I'm not sure how to interpret this, but maybe it will help someone with the Chrome issue. In TWRP, I did a backup of Data with the "bad" behavior with Chrome. Then I did the flashes (OTA, Evol zip) as described above. I think that the Chrome problem was fixed (tried for over 10 minutes). Then in TWRP, I did a restore of the "bad" Data and rebooted. Chrome is still good! So is it something about vendor that is different? I don't know much about vendor...maybe someone can see the difference in the vendor versions?