Human Divine Paragon Cleric 5/Inheritor's Crusader 3/Cleric 3
<blink> Do you really have levels in the base cleric class and in the cleric archetype divine paragon? That's against the rules. I suppose it's a little late to be pointing that out, but still.
Your BAB is +8 or so? Or will be shortly. Improved Critical (longsword) is a good bet. Lunge is always nice to have. Weapon Versatility will get you through DR/bludgeoning and DR/piercing, which even a +5 enhancement won't.
I suspect the level of Optimisation I expect and use in my group are different from yours so my advice may end up being innapropriate
1)Dump the Helm of Underwater action and Ring of Feather fall they are largely useless (My players rated the helm of underwater action useless in an Ocean going game and you can get 12000gp for it enough to make that headband +4, and with 111 hp for falling to worry you it has to be a long fall)
2)Can you retrain Iron Will to almost anything else , except maybe for the Paladin your will save should already be far better than anyone else .
3) Get a better headband of Wisdom, your wis is low for a mid level cleric and even if you mainly melee you main melee boost is your spells
4)If you do get improved critical change out the sword to Undead bane or something not Keen (not a bad idea)
5) Consider Divine power , a better version of Divine favor.
6)If no one is casting haste get blessing of fervor
7)Life bubble is a niche spell unless your GM loves cloudkill and there are a lot of good 5th level spells
8) you only have 1 of most of your high level buffs try to get more by dropping spells or..
9You appear to have scribe scroll and no scrolls. Scribe lots, duplicates of your buff spells , important niche spells like Death Ward, Life bubble, communal resist and protection from energies, restoration, raise dead, Heal and some more heals (actually combined attack and heal spell vs undead)
10) Get some wands of Cure light wounds to handle out of combat healing, most parties I see have had a bag of them since level 4 it stops wasting your spell slots
11)Feats like Extend spell or Reach spell can be useful. Reach spell combined with heal (once you hit level 13) will let you save party members from death at range or do massive damage to undead
12) If you want value from Divine Obedience you should be taking levels in Exalted or Evangelist prestige classes so you actually get the nice abilities at a useful level. Exalted is probably better for a cleric