Walkera22E: what is wrong with your current BL and Lipo setup?

You can put nearly any upgrade into the 22E, it is just a question of does it really help at all, and is it worth the money.
BL, Lipo, CNC head, carbon blades, servos, a good Tx/Rx with separate gyro, better frame/landing gear/tail structure, belt tail, heat sinks...

A lot of money to put into a heli that flies well already... That being said, the lipo, and carbon blades would be the best place to start. Heat sinks too.