You'll probably find at least one that shows everything early, my first Afi strain was like the canary in the coal mine, even got yellow first, heheh. I'm sure you can keep them in line.
Heheh a little bondage always gets a strong reaction. I think it was tunes journal where I read he supercrops the branches so they are hanging. Keeps anything from slipping out the tied end, and they won't straighten up much but they'll still mature fine. And the pollen will collect where it's easy to see, in the bad end.
I know they can be poisoned easily enough but they can take some shredding and survive, tough buggers.
I'm not sure why you want them taller to put them outside. Watchoo talkin' 'bout? I think they'll stretch plenty when you take them out into that lovely sunshine you lucky bastard...ooops heheh said that out loud, sorry,
You just want to see them grow faster dontcha? I know I would.
But if you want to stretch them pull your lights higher and turn a few off, that should make them stretch. Maybe just a bushy strain though, skinny branches won't hold oz's up without support.
I would probably start to harden them a little now with a little time outdoors each day, get em used to the big light, but I don't know what you have planned. How much daylight are you getting these days?