Trimmed up like this, with good air flow 4-6 should be the number your shooting to flower, any less and light is being wasted, anymore and you cut back on yield. I think, based on your space those are the numbers I would shoot for. I have a friend that has 9 plants in flower and he rotates them and takes down one a week. There are all kinda things you can do to maximize your space....but you really don't need the excess so your game plan is right on track. I like the way it is going too buddy, you do good work.