as far as the blueberries go you wanna keep them compact, they will stretch when they hit pre-flower, if you cause them to over stretch now then you could end up with a poor frame thats thin and lanky, i see your using an enviro light which you can get really close to the plants , i know a few people who use them for vegging as you can get quite tight internodes, the only thing i find wrong with cfl lights is because they dont have great lumen output and the light isnt considered strong then you cant get very high on the ec's , if your using a more agressive light the plants will take a stronger feed and grow bigger and sturdier
you dont have to listen to my advice mate as its your grow and i imagine that you might like to learn and teach yourself along the way but so far your doing pretty good :thumbs:
all the best