1000 watts for clones is a bit strong. Along with being 3 feet from the clones could being giving them to much heat and not enough humidity. I would try a cheep TL - florescent setup you could get at Lowes. Most use 2 fixtures, 4feet long and get both the cool and warm bulbs. Last time I bought some the ballests were 8 dollars each and 7 dollars for 2 bulbs. Many also make a different space for their clones outside of their primary veg and group room. Simple plywood box with hinged door works great. To put in the box I would also suggest a humidity dome for just started/cut clones. Keeping new cut clones close to 100 percent humidity is optimal and slowly reducing that humidity as you seem them root, getting to about 50- 60 percent humidity for veg.
For nutes, use very little for the first 2 weeks, after you see them completely rooted (2 weeks should be good) you can start feeding them complete strength. Slowly introduce more nutes, but 1/4 strength may be right at first.
Hope this helps,
cousinVenny