I still think your coating is not even… The material test is not very informative… It should go from light to dark… it’s almost monotone across the whole test area… Zoom in and you can see that it appears there is variations in the coat thickness…
Might check out this thread… there are a number of them for ntm and for different mixtures of TiO2.
Some of these use paint with TiO2 being the ingredient, some of us have strived for a less toxic way of doing the same without the issues of paint removal.
