The gyro only works in yaw, so wont have any effect on forward motion.. The comments about these co-axial helis being very stable is spot on.. They are designed to be stable and easy to fly (even i can fly one!). If you want fast and manoeuvrable then you probably need to move to a more advances single rotor type. Moving the tail rotor top the bottom wont increase performance at all but will make the rotor easier to damage.
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