you could also raise your lights a bit, they will grow up a little more and make some space for more bud sights, then lower them back down in a few weeks once they develop
adding some lower cfls will help too.
once they stretch up a little, feed them a high PK- 0-12-5 fertilizer
here are a few pics of what it did to mine just by raising the lights up a bit

similar canopy, the middle pic is before the lights were raised, 1st pic you can see some twisted/tied back branches