Denser Buds

hi everyone this is my first post and just need some advice on getting denser buds ?
my set up is-
dr150w tent
x2 600w hps lights (grow lux bulbs)
8 pot wilma
im using the canna range of chemicals (aqua vega, aqua flores, boost, pk 13/14)
the strain is blue cheese at the mo

if ive missed anything out just say

what are your temps?

have you got a co2 maker? tend to find that once you start using one buds tend to get a lot more dense.

doesnt have to cost much either theyres some great d.i.y sugar and yeast recipes in the main forum.

hope this helps dude