AfGoo Mix Grow,...Not tons of side shoots and they are small

This is my third cycle with my set up, I currently have 53 plants under 3600 watts. I was given the clones by a friend and was told some are a Af-Goo\Kush mix and the others are Early Durban\Super Silver Haze cross. I vegged the plants for about three weeks, and am 10 days into flower. They look small to me, and I am used to sativas but I am curious what's going on with these.

Alot of them are around 12-16 inches tall which seems pretty damn short to me for being 10 days into flower. They are definitely still growing pretty quickly, but they seemed slow to veg. Alot of them lack secondary shoots, just a bushy little plant with loads of leaves (typical with Af Goo I've read) but I am worried about getting a low yield. Have you guys grown bushy little guys that just fill out into one big cola?

I am not getting loads of light penetration because these things are so damn leafy. They look really healthy, I can post pictures at a later date. Nice fan leaves, good stems... just not a ton of secondary shoots...and some of the secondary shoots while there, are small and hug close to the main stem. Curious what y'all think.

I have them at 1050PPM already in flower and they are taking 1050PPM just fine. I see some bud formation starting. Will get some pics up soon.

Since I see white hairs and tiny buds forming up top, that means my plant has likely stopped vegging right? I am pretty concerned because I shoot for about 23 grams per plant, and I'm just not seeing how that will fit onto the plant unless it continues to grow upwards, but even then... the light is having a tough time penetrating the canopy far down though bud formation is def. down in there. Is it too late to use a product like bush master or something like that to get some secondary shoots going?

not everyone at once, i cant take all this information in. haha just kidding any experiences are appreciated tho

all indoor plants ive grown ive had the same thing happen to me. except i was using cfls/ On the other hand if it does turn out to be just one cola, all the bud will be just as potent, no small nugs, all huge big shwaabangs!!!!