I also just used my lightsaber on him deflecting his shots and the getting in one hit each time. You only have to do this about 3-5 times on medium to get his shield down.
I then didn't think to use force speed and just backfliped away when he tried to hit me and the came forward and hit him again with my lightsaber. I could get in 3 or 4 hits before his shield came back on and although it took 5 mins or so to kill him I hardly lost any health.
I had tried at the begining to get on the rafters and shoot him with missiles etc. but I tended to get hurt a lot either by him shooting me while I had a gun out and couldn't deflect or by the rafters colapsing from the rocket blasts.
If in doubt... use a lightsaber...
"If u try to chase 2 rabbits.. u end up loosing them both"