oggers,
You seem to be missing the point and confusing some things.
1. The centre of valve crown thermocouple is tracking the EGT more closely because it is basically an EGT probe. Look at where they positioned it
You are not looking at the relevant trace for a start.
So you now think that the valve thermocouple placed in the head of the valve 1/16" (1.5mm) from the face with the combustion chamber indicated a temperature more representative of EGT than valve? And also that placing the thermocouple as close as was physically possible to that face biased the temperature away from temperature in the combustion chamber toward EGT more than if it were where in the valve exactly?
And on that basis you reject the report data showing that EGT and valve temp correlated well. Bearing in mind that a few posts back APS cited this report as "definitive".
2. The valve temperature that matters is the valve face/seat
I am not sure how much closer you to the valve face than 1/16" you imagine the thermocouple should be so as not to be "basically an EGT probe" instead of a 'valve face probe'?
Why not simply accept what the report shows loud and clear - that valve temp for the most part correlated with EGT?