I guess the new gyro should be mounted the same way as the old and that is vertically with the sticker to either side.
It's easy to know if it's right or not, if you mount it lying down the heli will spin out of control upon trying to lift.

Are you sure you don't have any mixes working on your radio?
Duals set at low value?
Expo set at low value?
Any delay settings on the gyro?