25 square meters then that would be 5 meters x 5 meters, that would be a medium sized room. In that case, the rooms would be approx. 16' X 16'. depending on the height of your room(I'll assume 8ft). Volume would be 16' X 16' X 8' = 2,048 cubic feet. Depending on the exhaust fan/ carbon filter...
Light is fine, Scrog is fine, normally it is done with clones though. Scrog will just keep them growing nice and even in height and long as you train them.
I don't think a scrog has any effect on the increase of yields. SCROG was designed for grow areas limited in height and lit by fluorescent lighting. I'm sure you can get increased yields with optimum conditions, but the scrog on it's own increasing yield, No.
As for those strains, aren't they...
It's all genetics, like a few others have said. You aren't going to turn a 4 banger into a hemi by duct taping a turbo charger on the hood...
Benefits of a mature lady, better chances of getting a max. harvest. Bud production is based on genetics as well.
Depends on genetics, strains all have bud production thresholds, it will not produce more than this and that is under optimum conditions(even with Co2). Period.