Augment Summoning is currently only applying to creatures created by Summon I through IX, all other summon type spells that I've tested do not apply the strength and constitution enhancement bonuses such as Planar Binding and Create Undead. Corpse Crafter also grants it's bonuses correctly to summoned undead; I mention this because in another thread EO stated that Augment Summoning and Corpse Crafter stack; it appears they do not as Augment isn't currently working on anything not from the Summon line of spells.