I do think I figured it out...it seems like it's mixing with an excess of sebum and dead skin cells, which I have always produced a lot more of. I can reproduce the lather on my face (to a lesser degree) if I wash/exfoliate with BS/water too.

Also if I reapply the mixture a second time on my hair/face, ta-daa! No lather. This kind of makes me feel like a sheddy, oily household pet but whatever. Lol. Thanks