If blades are balanced then check the tracking (use a bit of bright coloured tape on the end of one of the blades). Always bend the higher blade down to keep the head speed up. Be careful not to snap the blades. You can use a heat gun to assist.

As for the drifting. Try to balance a roller bearing on a sheet of glass and you are half way there since you also need to worry about inertia as it falls and the tail spinning around making you lose orientation.

Yes it is easier when you are 3ft off the ground but only once your fingers are trained to react quickly.

Have a play on the FMS simulator first. If you have the Zenshua controller, order a pc cable and use PPJoy to configure... (a quick search for ppjoy on this forum will get you going)