I use my own method just like I am guessing most people after a few extractions do.
I use phosphoric acid instead of HCL or vinegar.
I cook the MHRB longer and more times than any of the teks out there require (and find that I can still get spice out of my 5th and 6th cook).
I use only enough lye to bring the pH up to 11.8-12.00tops
I use much less naptha than is called for 75mL per pull.
I do many more pulls do to the small volume of naphtha, but I never need to reduce the volume before sticking in the freezer.
I will let my basified jug sit in the closet for weeks after it appears to have stopped giving up the spice, and can usually get an additional 300-400mgs from that (1/2K of bark).
I usually grind up my own bark, but it's really a pain, and have probably switched for a while to powdered bark.
I've tried STB extractions, but the clean up and waste of NaOH seems to outweigh the extra steps in an A/B, plus I like to be able to defat the acidic solution before basifing. I also really enjoy the extraction process and am not looking for the easiest way possible. Stealth is also not an issue.