You have many options here, but all involve replacing the heli frame. IMO I have found the geometry to be just slightly off on the head and it has a more aggressive feel than other helis out there. this may have been because I was still new to the hobby when I flew it though. Other than electronics there really isn't much out there for the heli.
Speaking of electronics, if you purchase the DS410's for the cyclic, then the DS520 for the tail plus the 450mx align motor and 35a ESC with the GP790 gyro, you are right at the price with just the electronics to actually purchase the Align 450 Sport V2 Super Combo. A very stable helicopter and a great way to learn on. Yes, the sticker shock of $300+ is a little high, but if you really set down and think about that, it's worth the price.