If you cant win with a sog small plant setup with vortex (never ran it) and its advised to give it extra veg time, why not try a scrog? Run 1 or 2 plants with a screen. The thing about a SOG that scares me into running a scrog is the plant #'s. After 99 is where feds get involved I believe, had I not known that I would have 100's of plants in a 2 liter bottle hempy or coco grow with zero veg time to get a bigger yield in a smaller area. But I bumped up from a 4x4 to a 4x8 now so I have a little room to run LST'd and scrogged plants, however I think the 1 plant scrog I have is going to out yield anything else I have going by quite a bit (all TGA gear).
I just ordered the book called "secrets of the west coast masters" which is supposed to be all about getting massive yields out of low low plant #'s, like 1 plant per 4x4/1000w light and yielding #'s (plural) out of a 4x4. Once I get the book and check it out I'll post any good info I pull out of it.