To follow up on this, I did a recrystalisation of the product to clean it and to my dismay the amount of product went from, pre re-x, 1.8gms to just over 1gm after recrystalising. I was surprised that there was 750 mg of crud in the initial extraction. Funnily enough I left the residue in the glass I was using and 2 days later I noticed that it had kind of crystalised, I could see there was some crystals on the brown substance.

I still had some naphta in the same MHRB mix, I pulled it and put in the freezer, and when I weighed what this produced it was 280mg. I did a recrystalising of this, but I used the glass from the last time with the brown stuff in the bottom to mix the warm naphta and the 280mg of new extract. When the dish came out of the freezer today there were no crystals visible, only a layer that looked like frosted glass. After drying and scraping this layer off, it weighed in at 626mg of fluffly off white product. I managed to recover 350mg of the missing crop.