That's just the way these helis fly. With the tail motor being independant from the main motor they'll fly like that. If the tail was belt driven it would fly more like a 450 size.

Also these helis don't come with a HH gyro so you constantly have to fly the tail, which is not very fun IMO. I installed a HH gyro on my CPV3 which made a world of difference. I know I'll never fly my CPV3 ever again without it.