You are very resilient, ATM. Not making much headway, but full marks for effort!
Here's the thing about research into "what makes people different": be careful what you wish for. If researchers discover a "gene" for trans, or a brain configuration for trans, what do you think will happen with that information? You're lecturing on this to a board full of feminists, who, if they have done their reading (and there are a lot of very erudite, clever women here), know what historically happens when one group of people are "scientifically" proven to be Other. The dominant group then uses this as a means and a reason to control them. For many hundreds of years as modern science flailed its way into being, women were Scientifically Proven to be inferior to men, and look how that turned out for us, eh? Darwin, for example, was a massive sexist, and turned himself inside out trying to prove that women were less evolved than men. Same goes for all that was sacrificied on the altar of the "proof" that white people are genetically superior.
This kind of research is always politically driven, and it's disingenous to suggest otherwise. Right now, there's a lot of funding being pushed into trans research. And the results of this will be played out on a generation of young gender non conforming kids. The logical outcome of people like you pushing for a biological basis of trans to be discovered will be the sterlization and effective reparative therapy of a generation of kids who would otherwise grow up to be lesbians and gay men, or who would just happily desist from the GNC.
It is NOT politically neutral, and what you don't seem to be grasping is the blowback for women - the more research being done into "proving" that GNC males have "female" brains, the more tightly the bars of the prison of gender close around women and our "female" brains. We have been fighting for a century or more to leave that fucking prison behind, but now this tide of transactivism is threatening to push us right back in again and throw away the key.
Look at this and tell me that this is good science. Personally, I think it looks like eugenics.
For better or worse, the science is not there yet, and given the limits of controlling for brain plasticity, the dearth of evidence for any meaningful difference between male and female brains, never mind those that find themselves in the "wrong" body or not, we may well never be. The umbrella of "trans" has expanded so much that there couldn't possibly be one cause, anyway.
Isn't the compassionate thing to do to accept gender non conformity as something that has primarily a psychological and social aeitology and work out ways that we can all live that support people to be fine and happy, just as they are? That it is perfectly acceptable to be a gender non conforming male, and dress as you please, sleep with whoever wants to sleep with you, perform any role you want in life, but drop the pretence that you might change sex, and most of all, drop the requirement that everyone else collude in your world view.