I attend a monthly meet-up for trans women. There, I mog 70% of them and I’m a twinkhon. Usually, there are a couple passoids there, and over the years, I’ve met 3 or 4 gigapassoids, who transitioned young. I don’t know how representative this is for the whole population, since maybe there are some stealth trans women who don’t want to interact with the community, but if it is, then the brutal truth is: Most trans women don’t (and probably never will) pass.