Since I don't have any glycerin to add I tried just making the superlather. Used some of the QED SRP Sandalwood/Vetiver soap and a tiny bit of TOBS Sandalwood cream ... came out great would put it right up there with the proraso, not sure that it needs any glycerin added using the QED.
Was still lathering like I had just made it on my third pass. I did, however, dip the tips of the brush in some hot water and lather on my face to get it back to that state.
Pic is of lather before first pass.