ho ho ho holy shit dude
first thing: never func_detail a displacement, that breaks vbsp and your map wont compile
second thing: the reason i told you to turn those off is because none of them seal your map! i kinda left that part out of my post but it was heavily implied. only solid world geometry seals maps. if your floor is func_detail you may not understand the point of func_detail, read this
http://www.optimization.interlopers....er=func_detail (and the rest of the guide too).