Epic Spells: Lower the DC by burning XP/taking damage/adding minions/whatever.

Epic SR: Yup. Sucks.

Epic Touch AC: Also sucks. Boost your hit chances with Quickened True Strikes or other +AB spells. And boost your DEX as high as it can go.

Epic Saves: Ironically.. Blasting is better than save-or-lose in Epic. Because saves consistently get higher with each epic hit die. You will lose if you continue focusing on save-or-die in Epic.