Alrite oster

I figured i would give you a new challenge, i've been dealing with this every since my last crash and i'm at a loss i can't think of anything else, My titan won't fly, somethings wrong in the head, new feathering & main shaft, new flybar, new flybar paddles, new blades which i have balanced perfectly, for some reason the tracking will not be still, I set the tracking and spin it up, tracking is good till i get 60% thro and all of a sudden 1 blade jumps up about 2 inches higher then the other which makes a loud racket, does'nt make sense i've looked over all the links, and the balls and there all tight, i don't see any broken plastic parts either, Spin it up again and set the tracking, Reach 60% thro and get the samething, i'm sure it's something small that i'm over looking but i'm at a loss, and to fustrated to even think straight.

I'm on the verge of just saying to hell with it and buying a kasama head.