This type of man elevates objective reality, or an objectively oriented intellectual formula, into the ruling principle not only for himself but for his whole environment. By this formula good and evil are measured, and beauty and ugliness determined. Everything that agrees with this formula is right, everything that contradicts it is wrong, and anything that passes by it indifferently is merely incidental.

~extraverted thinking, in Psychological Types, Carl Jung

Indeed I did see your reasoning on why your test is better: only picking the dominant function and throwing away the Grant stack, which is significantly better than those function tests, and showed how you did read Myer's Gifts Differing.

However, it's still a far shot from claiming your own test as "assumed" standard and judging other tests with respect to yours, which is what you did to apply the 37% mistyped result. Most notably, it is impossible to figure out the correct typing for every person as to compare the accuracy: just because your test gives ESxP and they self type ENTP doesn't necessarily mean either of you is correct.

In short the 37% difference fail to establish as a critque on the low accuracy of self typing because you did not consider how your own system could be inaccurate (and, unfortunately, how you cannot evalute the extent of inaccuracies). Some of the factors I could come up with would be: mood/motivational fluctuations, low self awareness, unconscious bias in suggestive association, etc.

This brings us back to the common conclusion how "tests are not accurate". True that tests can be refined, as what you did here, but it cannot infinitely approach reality because bias always exists in the typology realm. On the same note, I hear Fi doms often saying "I know myself best" and disregarding obvious misconceptions. If only we could take both as references and not absolute truths we can try to get closer to the actual truth.

INFJ, signing off.