Hazed,
Problem with that downwards scissor move is you'll loose tremendous amount of E and if the enemy is any smart, he remains at altitude and then hes way above you and you didn't even benefit from the altitudes E (since you lost E with the spiral, which the enemy doesn't have to do when coming down on you), like he will, when he decides to dive on you.
Altitude is life - and that doesnt mean orbiting at 30,000ft, but using the altitude you have, the best you can.