Seems like 90% of the SOHAII issues are heatsink, heatsink, heatsink.
Before you take on this project understand the how,what, where, and why's of heatsink isolation.
Just finished my build but I'm having problems.
My R3P resistor gets really hot and starts to smoke, I've tried looking for shorts but I do not see any.
I orginally had LV- and H switched around and it was working okay there, but after I corrected it this happened.
EDIT: Fixed it forgot to put the plastic washer back onto the H reg I guess I should get some rest haha..