Not to spam my own thread but here are a few control tips:
If you need to land, use your thrust to land softly. If you land hard, you'll flip sideways.
When you start tilting while on the ground (a botched landing) you can sometimes salvage it by pushing in the opposite direction to balance your character back to his resting position.
Use very minor adjustments on the left and right movement, if you gain too much momentum you're toast.
Don't just hold down hover, you'll have to use it in bursts to maintain controllable flight. Also once you are moving in a direction, you can quit pushing in that direction and just worry about your up and down movement and the character will float along with the momentum applied.
Hopefully this helps, I'd love to hear some more feedback from other people if anyone has the time to check it out!