You could also just accept a poor Ref save and use your cleric elemental protections to migitate most of the effects of failure. It's not quite the same, but if you're a PrC'd cleric, then it might be best just to give up on your Ref save in particular. Universal save boosting effects would still be a good idea though.
Divine Agility adds a huge bonus to Dex, but it doesn't last very long.
Mass Conviction and Recitation are both good spells in general, since they can affect a whole group of characters. You'd be adding +8 to your saves with the combination, plus the effects on other characters AND the plus AC, att. That should help you out quite a bit, with your clerical energy wards making up any shortfall against the most common Ref save attacks.