Trying a Shield Slam Ranger - ideas, issues, etc

[Ivarrwolfsong]

So I'm making a weapon / shield build ranger. The fluff is he is an Ulfen warrior and wanderer, moving from conflict to conflict, battle to battle in search of meaning. He worships Gorum and has spent much of his early life among the minor skirmishs between other humans in service of minor lords among the Linnorm Kings. I'm going with a more forlorn, "ubi sunt" type of feel.

Level 5 - Ranger (Divine Tracker / Infiltrator) 4; Medium 1
Str 18 (17+1 at 4th)
Dex 14
Con 14
Int 8
Wis 13 (+1 at 8)
Cha 12

Traits - magic Knack (ranger): other trait ... Shield Bearer?
Feats-
1- imp Shield bash
1 human - Spiked Destroyer
2 Ranger - Shield Slam
3 (Medium) - Spirit Focus- Champion
5 - power Attack
(Might swap 3 and 5)

I'm taking War and Destruction as my blessings from Divine Tracker and Human and Evil Outsider as my pref enemies, respectively.

I'd two-hand my large shield, getting a free bullrush from Shield Slam which allows a swift action attack with armor spikes from Spiked Destroyer. At range I'll throw weapons at penemies I suppose, but with access to the untyped +10 speed boost from the War Domain and access to Longstrider or Expeditious Retreat, I can close quickly.

Two hand Shield Bash damage (+1 enhancement)
+6 str
+6 power attack
+2 spirit bonus (medium)
+2 seance bonus (medium)
+1 trait
+1 enhancement
+2 Destruction Blessing

+20 damage (+24 vs Humans; +22 vs Evil Outsiders)
Free Bullrush (and knocked prone if hit a wall) with swift action armor spikes attack.

Armor Spikes (always count as 1 handed) +1 enhancement.
+4 str
+4 power attack
+2 spirit
+2 seance
+1 enhance
+2 Destruction Blessing

+15 damage

At Ranger 6, I'm leaning toward Shield Master, but may take Two Weapon Fighting and give up 2 handing my shield for an extra attack. Alternatively, I could forgo a Str belt, get a dex belt and take TWD as a normal feat.

Any suggestions?

EDIT - for PFS

[BadBird]

With Blessings each taking a standard action to activate and only lasting one minute, you probably won't be using two in a combat; you may not even want to use one if it means losing a turn of fighting for a minor boon.

Personally I really like the Guide Ranger for the fact that you get a full favored enemy bonus a few times a day on an enemy of choice instead of hoping for the best, but to each their own. Guide makes opening up on a big target with two weapons guaranteed to really shred face. I like Wild Stalker as well, but most people would disagree...

If you're willing to go 2 levels of multiclassing, Scarred Rager has the ability at level 2 to rage while attacking, turn the rage off, and then have the fatigue caused by rage end at the start of their next turn - so they can rage again for a round, or not, as they wish. Combined with taking Reckless Abandon as a Rage Power, you get a total of +4 to attack and damage from raging: +4STR, Furious weapon (basically a free extra point of enhancement for a rage character), and +1 Reckless Abandon. When you shut the rage off after attacking, you've got only a -1 to AC and attack until your next turn begins (Reckless Abandon and rage are off, so no -3AC). Anyhow, Scarred Rager seems like a really character-appropriate Ulfen thing.