At higher diopter the centimeter measurement is difficult to do accurately, also often we tend to be optimistic with where blur really starts.
Doing centimeter with differential then adding the diopter equivalent centimeter to the result can sometimes help.
It often can make sense to start over with the course sessions. It’s very easy to overlook things the first time around, and less than ideal habits can get settled and overlooked. Looking at it all from the beginning and revisiting steps, can be useful.
That and looking at mixing up habits, as a second step. Pick one thing that you always do as regular daily habit, change it. Wait a few weeks, see if it changes any part of how you see. Example if you take a walk late morning usually, switch it to the afternoon. Move breaks around. Change lens use. Only change one thing at a time, doesn’t have to be major at all. It’s easy to underestimate the effects of habits, best way to tell is to make some changes.
1) My troubleshooting playlist https://www.youtube.com/playlist?list=PLgB_5pbB86Gh383GV6wdQrbQ8vTiOAj7W
2) Tear fluid can be measured. It’s a slightly uncomfortable process for a few minutes but certainly doable.
3) Big picture: Apart from above gradually shifting around habits, introducing a third focal plane can also be useful. That’s very much an experiment. Could be for example previous normalized for night time / movies, or a lower differential, or even a higher one with screen at further distance. If 6+ months have passed since any measured vision change, usually means the biology is not considering anything you do as a stimulus incentive to change.