Thanks for stopping in! I'm glad you're still looking at the innate attack DCs. I really encourage you to have druid levels be part of the calculation. It's a good way to make a little dent in the power you get from multiclasing (divine might, feats, martial weapons, tactics boost). Also adding tactics boosts to the 5/6 cores would help.
On the topic of innate attacks, as Edrein noted the cooldowns and SP costs should be looked at also. Some of them (jaws of winter is a good example) have really excessive coldowns.