dude, i've grown indoors and believe me i know when your plants are un-happy because of small pots. you got to get those plants into much bigger pots. like 3-5 gallon pots. then i wouls say give them a few more fets for the veg. stage i.e. nitrogin so those babies can go. leave them about 3-4 weeks more or once they are at least 20-24 inches tall. that way you know the stem will be wide and strong enough for lots of big buds.if you choose to change to 12-12 right now that would not be a bad thnig because they probably are ready but your yield will be quite low and i can tell you put way too much effort in that nice set-up so now you need to have patience.i hope i help in some way. sorry this post is a bit long. peace!