Back again with a few more off the wall tactics.
-Using the Dead Gith as a shield. Telekinesis or Brute Force, but get that body to where it can do some good. If he gets to cut up, just chuck it at them and knock them down.
-Living Gith (including Queen) as Improvisational Weapons. Hows the fighter's or paladins strength? If he can lift them feel to use them to bludgeon their comrades, doing damage to both them and the comrade.
-Eyes and Hands. They are needed to cast, fight, and target most psi abilities. Therefore your opponents shouldn't have them. Remove or disable them at the first opportunity.
-Portal Spaces = Bad Guy Storage. It worked to get you in. At worst they panic and tear the bag, scatter themselves on the astral/what ever plan you need.
-Disarming/Sundering. Toast those pikes and you should be able to take the advantage on the toad boys.
-Fold, Spindle and Mutiliate. Gith probably aren't good in a clench, so grappling them and asking if you can start making break checks against the hardness of their skeletal structure might be something to try.
-Alchemist fire or Acid. May not seem like alot of damage, but if you can force them to ingest it, apply it directly to an eye socket, or pour it in an ear.... Well I'll leave that to your imagination.
And remember if you can't pull it off, well, fight well and hope she's taking prisoners.