Eyeballing the curve from the test with the thermocouple gives a peak valve temp at no more than 10ROP, not your 25ROP and definitely not the 40°ROP you claimed previously.
Let us assume you have a well-calibrated eyeball, oggers, and that the peak in valve temperature is, in fact, at 10 (or 9 or 8..) degrees F ROP.
What is your theory on why valve temperature goes DOWN as the mixture is further leaned past that point - whatever it is - and EGT continues to go UP to peak?
Even on your own observation and interpretation of NACA-754 Figure 8, valve temperature starts going DOWN before the EGT peaks. How can that be so, if EGT 'drives' valve temperature?
The knowledge that valve temperature is linked to both CHT and EGT is well and truly established in the engineering literature and the publicly accessible data.
I trust that after your lecture on the scientific method, you're not suggesting the assertions made in what you quoted from EI constitutes "data"?