hrm, if your heli is tail heavy, then that could very well be your problem. If the battery is all the way forward and you are still tail heavy, then there are a few things you can do. Shorten the tail boom up to about 1.5" or so, get a bigger battery and push it all the way forward, add some weight to the front, or take off your canopy and move the battery farther forward.

Also check out radd's and see if that doesn't help, also the v17 heli guide on this page can help you learn alot about heli setups.
http://www.heli-max.net/mediawiki/index.php/Links

Try just scooting around a smooth floor (like a hardwood floor or a trampoline) with the training gear on, that might help also =)