I would imagine that it would like a medium output PSI tank. Any high psi tank should work, most probably don't hit the 800 any way.
The manual should say what lube is good. I would stay away from dow33/55. It should probably be like slick honey or w/e the hell is selling these days.
You can always call BLAST, they generally have pretty good customer service.
There was some discussion awhile ago that one of bobs new guns got a ridiculous amount of efficiency increase with an ultra low output tank. This is totally unproven and pretty much BS.