Build questions: THF

[ChakatSilvermane]

So, after getting owned on an elite quest (which I was 6 levels higher than), I am questioning my build. I take a huge amount of damage pretty fast and I am wondering if this is a problem with my build, or (much more likely I think), my equipment.

Level 11 Fighter
Feats
Power Attack
Die Hard
Cleave
Great Cleave
Improved Critical: Bludgeoning
Improved Two Handed Fighting
Stunning Blow
Toughness
Two Handed Fighting
Weapon Focus: Bludgeoning
Weapon Specialization: Bludgeoning

Enhancements
Fighter AC Boost 1
Fighter Attack Boost 1 and 2
Fighter Haste Boost 1
Kensai Maul Mastery 1
Fighter Critical Accuracy 1 and 2
Fighter Kensai 1
Fighter Strategy (Stunning Blow) 1 and 2
Fighter Maul Mastery 1
Human Adapdibility Strength 1
Fighter Item Defense 1
Racial Toughness 1
Improved Jump 1
Fighter Strength 1, 2, and 3
Fighter Toughness 1, 2 and 3

Total Health: 227

Equipment (This is the part I think is the problem)
Weapon: +4 Icy Burst Maul (1d6 Cold + 2d10 Cold on crit)
Hat: Admiral Tricorne (+13 Jump, Seeker +4 [+4 to confirm crits, +4 damage to crits before multiplier])
Goggles: Blindness Ward Goggles (Immunity to blindness effects)
Armor: +4 Adamantium Full Plate (DR 3/-)
Bracers: Axe Bane (DR 5/bludgeoning, piercing)
Ring 1: Charismatic Ring of Resistance (+2 Charisma, +2 resistance to saves, tiny augment slot)
Ring 2: Acrobats Ring (+5% movement speed, +3 comp jump, +3 comp tumble)
Boots: Feather Fall Boots of Swimming (Feather Fall effect, +3 comp swim)
Gloves: Linen Handwraps (+4 enhancement strength, -1 dex, Immunity to disease)
Belt: Health Belt (+1 con)
Cloak: Envenomed Cloak (+2 save vs poison, Poison Guard, +3 enhancement bonus, part of the Might of the Abishi set)
Trinket: Voice of the Master (+5 EXP bonus, +1 luck saves)
Necklace: Underwater Necklace of Preforming (Water breathing effect, +3 perform skill)

Stats
Str: 27
Dex: 14
Con: 18
Int: 8
Wis: 9
Cha: 10
Armor Class: 23
BAB: 11
Fort Save: 14
Reflex Save: 8
Will Save: 5

I am VIP, but I haven't done a lot of farming for equipment or anything.