You've got to balance and track the blades. There's stuff about it on page 89 of this thread. Balancing is easy enough. Just take the rotors off, slide a shaft (small wire or CF rod) through the hole in the hub and hold it vertical (like a ferris wheel), and place tape under the blades until it's balanced. When it's balanced, the rotor assembly won't have a heavy spot. Tracking them is harder, and more important if you want to avoid rotor collisions. You'll want to set each blade to about 22° pitch. You can try to curve or straighten each blade by hand, or heat the CF blade rods near the hub to soften them and add/remove pitch that way. Be careful, though. Too hot and the CF rod will just melt.
Going to fast forward or aft will cause the rotors to collide, but you should be able to hover and move slowly without it happening. It's too bad they didn't put a little more quality control in the rotors, even if it cost a bit more. These things will actually fly pretty good if you get them set up right, but getting there can be a real bear. You might even say it's Grizzly
Once in a while you get lucky with a set of rotors and they're good out of the box, but that's not very often. There's another tip around page 89 about the hub adjustments (I think), and it's a good one.
If you're not getting enough forward/aft speed, cut the ring off the tail blade. It slows it down too much.