I remember getting the request to blow up the adyasa's reactor... I remember trying to do that at least 3 times but I just got blasted away by those frikking sweepers, so in the 4th replay I just forgot about it and went along with the other objectives...
Will try it again sometime during the week
So I just happened to do it an hour or so ago halfway through my run-through.
I tailgated Sera 2 and let the Adasya's lasers get distracted by Sera 2 and Cherubims (not cannon fodder, honest!), went zenryoku zenkai with the engines (not any ounce to shields and lasers) into the Adasya's shields and let loose. The EMP cannon blew up the reactor in quite a few shots. I timed my approach and angle, going from the bottom. There wasn't any time to go directly underneath it, so I went in diagonally.