Why not have one avenger squad & a guardain squad?
The guardian squad only has a 12" range and needs 4 to hit. Also a squad of 12 (with scatter laser) gets 26 shots. A squad of 10
DA with blade storm and exarch with dual
DA Shuiken Catapults get 32 shots (27 hit on 3, 5 hit on 2) at 18".
Sure when you bladestorm you can't shoot next turn, but more then likely you either killed the unit you shot at so you would need to reposition, or you didn't kill everything and your
DA might end up getting toasted in the next turn of shooting.