Joe,
I had the same problem with 2 different helis.
On both of mine is was bad cheap plastic covered blades.
At differet RPM the plastic would flutter and throw the blades out of track.
Get about 5 feet of mono line and tie each end to the fly bar right next to the head and let it hang.
It should be horiziontal and *NOT* leaning to 1 side.
Make sure the blades are not to loose.
I tighten mine so that when I grab 1 blade it won't move in the grip from the weight of the heli.
Check for excessive play in the head.
Check the servos and make sure their working and not binding.
This can be done with the motor off and just working the TX controls on the bench.
You have a bug in the heli but tracking it down may be the biggest problem.
Please keep us posted.
Vegas/