Unless you get the extended shafts from bladecxpro.com, there is really nothing you can do about it.

When the heli is moving in one direction, immediately reversing the stick to the opposite direction in too much of a hurry will cause a blade strike.

Also, sometimes normal flight can cause one also, if the heli catches the air just right. It's just a problem that a Coaxial will have, again, unless you upgrade to longer shafts and shorter flybars.

You may not have actually done anything wrong, it just happens =/.

Once I moved my servo arms out, I have just ben super concious to ease off the right stick when I want the heli to stop, instead of just jamming on it. With a little practice, you can still fly normally, you just have to adjust the movement of your thumbs.

Also, practice panic-flying (OH **** IM ABOUT TO RUN INTO SOMETHING!!!) and coming out by using both sticks in one horizontal direction, aka --

As you are flying at an object, instead of pulling back on the elevator, give left rudder and left aileron, and swing it around hard, this usually prevents the strikes that are common when trying not to hit something.

Other than that, it just comes with the territory. Unfortunately, it will get worse if you adjust your servo arms for more cyclic response.

Bryan