I used Chrome 63 until about 2 days ago, didn't really get eye strain on my known-to-be-good setup. And I use it a lot, several hours a day. Now I switched to Chromium for other reasons (v. 65 currently). Maybe it's something else that you changed recently? I noticed that sometimes, when I had been exposed to other problematic light sources, even my "good" devices can't be looked at for too long without trouble on the same day.
Edit: You could get all versions down to 49 here and test them: https://www.apkmirror.com/apk/google-inc/chrome/
I can't really help more. I used Chrome every day the whole last year. It must have been a lot of versions and they all seemed OK for me.
Test 56 first, if it's better then test 60, if not then 52, and so on... Fastest way.