the ballast is a digital greenhouse 600w, so maybe that light isn't 1000w after all?
That's scary. I would defiantly double check all this as it could be a severe fire hazard
Well, I didn't mean to take you off topic. But I think in the end, instead of wasting money in the long run on little results.
1. Buy that 8 bulb T5 fixture (comes with the right bulbs too)
2. Buy some rapid rooters and a large humidity dome with some Clone-X rooting gel. (check out some videos on cloning, it's rather easy don't be scurd. U can use 1 low wattage CFL bulb for the entire dome on 24 hour lighting until you see roots)
3. Veg them while topping and bending for 2-3 Weeks under the T5 fixture using 4 or 8 bulbs as you need (it has a switch)
4. Then switch them to 12/12 under that beast 1000w and voila, you will have good results.