Mount optimization tactics?

[deuxhero]

So I noticed Aasimar get an alternate favored class ability for Oracle "Add +1/2 to the oracle’s level for the purpose of determining the effects of one revelation." while (Nature) Oracle's Bonded Mount revelation is indeed based on Oracle level "This mount functions as a druid’s animal companion, using your oracle level as your effective druid level.". Being able to use them with eachother isn't really disputable RAW.

For there you can take the Scion of Humanity alternate racial trait and Racial Heritage (Orc/Half-Orc, though how you can have an Orc in your family without a half-orc is beyond me), then grab Celestial Servant, Beast-Rider (so you can pick an animal that isn't awful and get a +2)

You now have an AC with a power of 1.5x+2 (x being your Oracle level, cap is hit by level 12 for a 16 HD AC), full BAB per HD, d10 hit die (average at all levels, including first), Smite Evil 1/day (useful for the HD to damage and DR ignoring alone, 1 to attack roll for some mounts is just gravvy) for just 3 feats (4 if you consider the effects equal to toughness you lose for taking the alternate favored class bonus)

Any way to improve this beyond that?

[lemeres]

Another, simpler option would have been to make your non-celestial half a halfling and make a small sized aasimar (allowed in the rules). You get to use a wolf as your AC then.

This can be pulled off at level 1 (which means you can use celestial servant immediately, and means it starts off with BAB 2), and it has the advantage of taking less feats. Am I missing something as far as AC optimization when I think a wolf (single natural attack=1.5x STR and Power attack, plus trip) would suffice?

Here is an interesting fact: The multiattack ability for AC's grants an iterative attack (as in it hits for BAB-5) if the creature only has one attack. So, with the boosted AC level, you get an iterative attack at level 7, at around the same time the 3/4 BAB classes would. This stacks the favor towards single attack animals a bit since their attacks get the 1.5x multiplier.

[deuxhero]

Beast Rider gives +2 to your druid level and if you need it, lets you have a flying AC (though a very weak one). You could alternately take Dhampir as your RH and take Vampric Companion (NOT Vampric Animal Companion) for 5 Fast Healing (though how the type changes stack is up in the air)