As has been said, Invoke is a godsend in this map. If you can get it on Silque (in addition to Genny already having it, obviously) you'll be able to summon some bulkier illusions as fodder. Of course, the downside to the illusions is they do tend to clutter up the map so you can find yourself boxed in and out of range to attack. Also, remember that the illusions can attack Jedah and effect the counter. (Though, in my experience, they prioritize the mogalls.)
Rescue/Warp also can be quite helpful, especially since Duma's range is so large and his damage is pretty intense. You can certainly cheese the other baddies with this, too.