thanks =] and I'm glad some found it of use!
EDIT: Some great advice in this thread.
One major tip (That I have to try & follow myself next time) and what I was confused about, + I suspect led to my low yields is ... evaporating the naptha down to a certain volume before freeze precip'ing. What is a 'certain' volume? That is still murky to me, but I think if your Naptha starts getting cloudy (showing signs of super-saturation) then it is good to go in the freezer..
My biggest yield was from my first pull ever, following the video, when the Naptha was simply evap'd away. You can see the size of the crystals left on the tray!
After that, I experimented with more pulls using more MHRB, and freeze preciping the naptha but it took much more to achieve the same amount.
BTW: Just got my GvG in the mail .. might be MiA for a few!