SWIM just did a STB on 100g MHRB and was blown away by the yield!!  In about 3 hours the yield was many times what he got doing an A/B extraction over a couple of days.  I think part of the improvement was much more lye.  Doing the A/B SWIM may have been "too smart" and using his digital ph meter thought that he was using enough when in reality he was short on the base.  Also he believes that since he put it all in a crock pot this time the Naptha was held at a much higher temperature (not boiling but enough to steam a bit)and could hold that much more spice.  Anyway, he can recrystallize and clean it up as much as he wants.  Reading elsewhere there was talk that the "yellow" could very well be 5MEO and other alkaloids that are very desirable in themselves...not necessarily trash and can be seperated and savored by themselves.  Cleaning them out may make the product less potent but more pure. 

Cheers!!