Strange, that usually works for the cards I edit..
anyway, I tried it out with one of his cards, and yea resetting the normalbodymap in material editor didn't do shit
so i tried removing the overlays in body section and replaced it with the usual stuff I use - card went from 63.4mb (I'm using the jeanny realight card from apuri as an example) to 51.4mb. After that I tried removing the outfits one by one, not much change till i replaced outfit 6 - it went down to 44.1mb. Removing every outfit only brings it down to 31mb, I was actually expecting it to go way smaller than that since it literally had nothing at that point, no idea what this remaining size is, maybe the measurements of the body and face

There is a limit to how much you can make the card smaller I guess
I also did forget to say earlier that even the amount of accessories used can contribute to the size of the card too, but other than that idk anymore