After you transplant them, wait a few days to a week to let the plant get adjusted, then you can FIM or top, or whatever you want.

I would suggest doing one of the methods. If you only have a handful of plants, and ur going to be growing under a 1000w light, you want as much surface area of the plant exposed to the light. Having a nice even canopy is actually pretty easy if u do all the plants at the same time.

I have a blueberry clone about a month old, i just transplanted it to a 4 gal container last week. Today i took the little tip of the plant and tied it away from the light. (loosely!!!) I use the wire ties that come with garbage bags, make a loose loop around the area i tie down, and then tie the string to that. it doesnt damage the plant like the string could by cutting into it.

have fun!