[PFS] Summoning Wizard build: Straight Wizard or Pathfinder Savant?

I'm making a summoning Wizard build: Wizard 5/Envoy of Balance 3/something 3

The last three levels could be wizard, Pathfinder Savant, or a combination of both.
Wizard gets increased duration of summon spells, increased Shift distance, the level 8 teleporting ability (from Conjuration [Teleportation] school), and full spell level (I get to go to lvl 11, which gives me lvl 6 spells)
Pathfinder Savant lets me add spells from other classes to my spell list, but my caster/spell-gain levels are reduced by 1 (I'd get level 5 spells @lvl 10, and no lvl 6 spells)
Adding spells from other classes lets me add Summoner spells to my spell list, which is great. Here are examples:
Haste = Summoner 2
Summon Monster IV = summoner 3
Summon Monster V = Summoner 4
Summon Monster VII= Summoner 5
SUMMON MONSTER 7 AS A 5th LEVEL SPELL!

Also, if I'm not taking Pathfinder Savant, I could reduce the Envoy of Balance levels to 2 instead of 3 and take Tattooed Mystic for the last 4 levels to be able to cast summoning spells up to level 5 as a Standard Action (or Mystic 2 for the same, but up to level 3). Is this worth it (not taking EoB 3 removes my ability to bypass alignment-based DR and transfer this to 1 ally 1/day)

Straight Wizard with Acadamae Graduate is probably better. Academy graduate is available as a PFS legal feat in a free resource. I dont see envoy of balance as being particularly worth it. You gain:

1. A small SR penetration bonus which your summons dont care about and neither do most of the best spells (glitterdust, pits, tenatacles, haste etc).

2. An Endowment which is very unlikely to come up in the vast majority of scenarios.

3. Penetrate alignment DR, it takes a standard action to transfer this to an ally.

In exchange for this you are giving up an extra feat, a longer distance on shift and dimensional steps.

I do currently run a summoning wizard in PFS who has recently turned 8th level. he is wizard5/bloatmage3 which has worked rather well so far.

The endowment I'm planning on taking is Planar Parity, which stops Protection from Alignment from blocking my summons and gives all *d summons the Counterpoised template in addition to Celestial or Infernal template.

I hadn't seen Academae Graduate before, but it looks supercoolio.

Anyway, do you think Pathfinder Savant is worth it for my last 2 or 3 levels?

As for Bloatmage, I was considering it but I didn't think it was worth it until Bloatmage 3 so I decided to drop it.

If you want to make a non-Summoner summoner, arcanist(occultist) is the usual recommendation. Turning low level spells into top level summons is pretty sweet.