drop your current light closer to the plants (i assume you've already done that). other than that, what can you do? make sure the ppm's are good, ph is good, temps are good, don't trim, water properly. Once you get the light, you may want to deal with heating issues. I have cpu fans blowing directly underneath that 150w hps sun system light i linked you so i can drop it closer than usual. 150w isn't hard to manage though, and these fans are only 70ish cfm. I plan to get 133 cfm'ers and a 250w hps and see what i can do. i plan to get the 250w on that eco site instead of sun systems. 50$ cheaper, and all i'm trying to do is solidly break the QP barrier for now. Might even buy a "fancy" hps light to replace the one already in it.
When i first started growing (like, just around the corner ago), i was all into doing "things." Now i've finally calmed down and realized, more happens when i'm NOT doing things. If anything, my doing things messed up my plants. I dropped my 70 cfm fan on my cryp plant and hurt the shit dick out of it just because i felt the need to be around the plants.