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I mean, when you have average gpas that go up into the 3.8/3.9 range, you would expect to have a higher MCAT average as well. So while a 507-508 isn't bad, it's not on par with what the gpa reported average are.
And because TX weighs the MCAT less, they are less inclined to follow in suit with AAMC and average them to find the most realistic expectation of a board score, because they seem to place less evidence on it as a whole.
Think of it in terms of how D.O schools believe in reinvention, and allow grade retakes- they don't place as much emphasis on initial grades. Same as TX not placing as much emphasis on initial MCAT scores. I'm not trying to argue with you, but simply stating this as someone who has been to info meetings with TX deans and as someone who has interviewed at TX schools.
Then something else is happening to contribute to lower-than-national matriculation rate, because a high GPA/low MCAT is not that difficult to achieve (relatively speaking).
And sure you may have talked to TX deans and interviewers, but you weren't there when adcoms were making evaluations. These stuff are done behind closed doors, so no one knows. I am simply showing the validity and reliability in averaging multiple scores, and why OP should follow the averaging metric to have the most realistic perspective.
I would rather be prepared with the worst case scenario and be very pleasantly surprised with a successful cycle than pinning my hopes on best case scenario and being brutally shut out.