Im doin a similar setup, only i stripped the material off my tent and replaced it with panda film and mylar due to offgassing problems with hydrohuts that were turning my babies into yellow bullshit, lol.
Anyways, i got 8 plants growin in a 2x4x5 tent, with a 600w digigreenhouse ballast, and ran a MH for veg (30 days), and am now in the middle of week 2 of flowering. Theres only six in the tent right now, and i have two WW Sativas that are still vegging in a top cab i fabricated for my 1st grow. theyll veg for another week, n then into the tent with the rest of the ladies. Even if the WWs are at 10-12 inches when i flower, theyll still end up being 2-3 feet tall, n thats only with 2 weeks veg (not including the seedling stage of 1 week). Everything else is the EXACT same, right down to the oscilating tower fan cooling the canopy off due to higher temps, lol.
I just wanted to post real quick and let you know that your shit is lookin good man, and i hope that the rest of your plants are ladies bro. Feel free to check my shit out whenever you want -- my temps are getting high again, as i leave my growroom completely closed up all day so the mylar can help hit every part of every plant, and the canopy is so thick up top that i dont even know if the WWs are gonna get a whole lot of exposure when i put them into the tent man, lol - its fuckin crazy. 1 n a half weeks into flowering, and every single plant has hairs on every node bro. Within a week or so, youll be seeing the same thing going on with your action too.
2 BlueCheese
2 Twilight
1 Northern Soul
1 White Berry
2 WW
All feminized
what sucks is though, once you get into "the stretch", your gonna end up putting your light all the way to the top of your tent, and just hope the plants dont outgrow the space you have left, lol. Should be cool though for sure. What are temps like in there with everything closed up, and without the tower fan blowing on them?? if its high, get into pickin up some Excellofizz co2 pucks. Itll be like giving them steroids in high temp situations man