When having problems with a tough AC in either the simulator or a mission, equip two laser rifles that fire at the same rate and hammer the AC. The ones shaped like drops of water are recommended. Laser weapons strip AC's of their primal armor and still inflict massive damage. This will not work on another energy weapon-using AC though, such as Stiletto (has high-power EN weapons and high AP). To counter that, get bigger (or as big) guns and decent AP, and outmaneuver them. On some ACs it is easy. With Stiletto, fight on the level with the solar dishes and use them as cover. You will be able to out maneuver her easily.