I have been growing my self some weed in kind of the same setup!!! So, from my past 3 grows experience (almost none) i really suggest that you put more $$$ in your grown room dude!!!
It will for sure make a huge difference!


- my setup -

FLOWERING ROOM

- 10 20wts tubes (4 warm/6cool)
- 02 40wts cfls (warm)
- 130cm x 100cm x 50cm

VEG ROOM

- 4 20 wts tubes (4 cool)
- 80 cm x 100cm x 50cm

Im growing in soil (Premium Rose pre-mixed soil), but i start my GreenHouse seeds (fem) on some JiffPots, and after the roots are visible on the side of the pots, i put them in a four liters plastic pot for 4 weeks of 18/6 light cycle in the veg room, and another 8 to 9 weeks of 12/12 light in the flowering room. In the flowering stage i give my babes some Hyponex mixture for blooming roses, dont know if it is the best, but i guess it is working!!!
All the 3 times i had a harvest i would say that i got more than 1 once per plant for sure!!! Or my friends are really stupid!!!

So, there you go mate, i hope some of these stuff i wrote you, will help you get better results on your grow:thumbsup:.
Take and care man!!!