I just had installed the tein flex system with the edfc control unit which adjust the damping .I also had an alignment as well .My question is this. Do i need to get and alignment each time i make a height adjustment with the the coilovers ?

 

Yes you do if you plan on doing any serious miles at a height which is different from when you had the car aligned.
If you mark the Sleeve where the collars were when you had it aligned, just put them back after you lower, everything should be kosher.