Interesting but I think you give abit of a contradiction there mate.
You said put the weakest plant under the screw in point of bulb
And then you go to say give biggest plants light priority.
THanks for the advice I'll post a picture of reposition pots to see if it is as you said.
Also do you think lights should be flicked to 12/12 now or hold until all plants are over 18 inches?
I said under the screw in point ''closer to the wall though'', could have been worded better sorry. If your screw in point is on the right side from the picture perspective then the pot needs to be near the right wall.
I've just noticed your other pic, that's not what I mean. I see the wire on left side, you want the smallest plant near the left wall from the picture perspective. It can be anywhere you want along that wall. Then you want two plants to the right of that. Those two plants should be lined up front to back (or to the left and right of the actual length of the bulb). The last two pots follow suite. So from left to right of the pic perspective you have 1-2-2.
I would slide the light a few inches to the right (from pic perspective) as you want the best plants getting priority (my perspective may be off due to pic angle though). The single smallest plant will get drowned out of light when the bigger ones stretch up and fill out. You should stand it on top of a wooden block etc to raise it to the same canopy height as the other plants, or even slightly higher. The single smaller plant may actually be the best one in terms of genetic yield but at this point I'd priorities those that have the widest canopy area to maximize light coverage (but that's me). If it was a cutting and you knew it was the better yielder than naturally it would go under the main foot print.
I'd also look to keep the light height from canopy at around 18" possibly 20" absolute max in your situation for flower. Covering more canopy surface area may be worth losing intensity if you are running a tightly packed sog. In your case you have many gaps in the potential light coverage area so it's not worth sacrificing intensity(closer light). Again entirely my opinion, feel free to ignore it.
I would probably flip those more or less now or within the week. You don't need to worry about stretch with topped plants like that, just lightly bend the more dominant tops daily. Nothing extreme, just lay them over so they are a few inches shorter.