Pathfinder Summoner Optimization Assistance

[metalith]

I am playing in a local game. We are creating characters at level 6. I need some help or suggestions for building a summoner. I like the Reach Cleric Play style and trying to adopt it to a Summoner focusing on Battlefield control. I like the idea of a Master Summoner Archetype with this build. Though that is flexible if someone can suggest better alternatives. We planning on playing to Lv 20.

We are using a 4d6, drop lowest method for stats and I rolled 11, 14, 16, 16, 18, 18

Half Elf Lv 6 Summoner - Master Summoner

Favorite Class bonus into more Evolution Points.

Str 18
Dex 16
Con 16
Int 14
Wis 11
Cha 21

Feats

(1)Combat Reflexes
(B) Skill Focus - Knowledge Plains
(B) Augment Summoning
(3) Arcane Strike
(5) Power Attack

Primary Weapon is going to a Longspear.

I'm planning on trying to make my Eidolon be a focused on Tripping but I fear it maybe to weak but no other idea what I can do with it, to assist with controlling the Battlefield

[stack]

Nice stats. As a master summoner, your eidolon isn't doing much in combat after the earliest levels. Build it for scouting/skills and don't bother getting extra evo points.

Check out summon good/neutral monster feats as appropriate. Superior summoning will help with bfc as well.

I wouldn't go half elf unless planing on taking eldritch heritage feats. Could swap the skill focus for a better weapon or boosted will saves.

[metalith]

The plan for Eldritch Heritage Abyssal and Improved Eldritech Heritage, for the Free Action Claws, for when they get in close and the +6 Inherint Str Bonus.

[metalith]

Here is an idea of what I see this character being at Lv 20.

CG Half Elf Summoner - Master Summoner

Str 30 (18 +6 enh +6 inh)
Dex 22 (16 +6 enh)
Con 16
Int 14
Wis 11
Cha 36 (18 +2 racial +5 inh +5 level +6 enh)

Feats

(1) Combat Reflexes
(B) Skill Focus - Knowledge Plains
(B) Augment Summoning
(3) Arcane Strike
(5) Power Attack
(7) Superior Summon
(9) Summon Good Creature
(11) Eldritch Heritage - Abyssal
(13) Improved Eldritch Heritage
(15) Celestial Obedience - Arshea
(17) Open
(19) Open

Primary Weapon is going to a Longspear with Claws for up close.