Try to lay off the Nitrogen when you flwr. Use a fert that has a little more Phosphate in it. Only use a little at a time though. Bette to under fert than to over fert.
To make the bud really dense go get a $45 dollar HPS from Home depote/lowes in the outdoor lighting section. They are 70-75 watts. Not nearly as much Lumens as like a 250-400 watter but you will see crazy growth and density when you use it in conjunction with your CFL. Plus they don't get that hot and the power consumption woudn't even be noticed.