Help or tweaks for a Phalanx Soldier / Yojimbo concept [PFS]

[Kraschong]

Hallo, I wanted to make a tank build with high AC and options to stall the enemy, like a trip build, or help others, Aid Another. What came out is this.

Oread

Phalanx Soldier 3 / Yojimbo 8(Order of the Shield)

Str 18
Dex 14
Con 16
Int 10
Wis 12
Cha 6

Both points to Dex

Lucerne Hammer
Full Plate
Tower Shield

Racial traits
Crystalline Form
Granite Skin
Treacherous Earth

Traits
Defender of the Society
+1 Will

Feats
1:Dwarfen Blooded
Shield Focus (Fighter Bonus Feat)
2:Mobile Bulwark Style (Fighter Bonus Feat)
3:Weapon Focus
5:Mobile Fortress
7:Vital Strike
9:Combat Reflexes
Power Attack (Samurai Bonus Feat)
11Improved Vital Strike

Without enchantments and items. So the basic idea is to first charge into the enemys and after that use my Tower shield and the Yojimbo skill to provide AC while use Vital Strike.
How can this build be improved, I find the attack rolls and damage lacking.

[BadBird]

If your character choices are all designed for maximal defense, it shouldn't be a surprise that attack and damage suffer.

If you want a more dynamic team-support concept, you could go for a pure Order of the Dragon character who uses Ready Action with the Strategy ability; you can set the triggering condition to the movement of a dangerous enemy, and grant the whole party immediate move actions. It gives all ranged characters a free retreat and all melee a pseudo-pounce (including maybe you).