Check the high end forum. Spritzer and a couple more did mod quite a few energizers - I have no idea if those users are still members or posting, though. Loads of knowledge have left theses boards last couple of years.
Search and ye shell find... it's only a couple of 1000 post threads long :)
I know of the mod to make a pro plug. I just do not recall seeing any mods to the sb units to up their quality. I'll look through the high end forum.