I know this is a shot in the dark, but I was just bouldering in Hueco Tanks and found myself in the cave/bay where sign of the cross is, and climbed a route that goes up a crack and then into a series of large huecos. It was chalked and clearly had been climbed before, but I can’t match it to any of the listed routes in the sign of the cross area on mountain project. It’s to the right of the V0 lughead, in the corner between that boulder and another. I’ve added a picture, if anyone can identify it that would be awesome. The start that I used was a seated two hand side pull in the bottom of the crack with feet on the wall, then proceeded upward to the large Hueco and continued up to top out.