Yes cobalt bracers are rare as hell. Anizok's minimizing device is cheap and plentiful however. It fits in the ammo slot, can be recharged and costs about 150pp per 20 charges. Price of minimizer can vary. I got mine for 500pp back when they were not rechargable.
Being large is not a disadvantage anymore. Like I said, any disadvantage any race has can be made up for with items or AA. Iksar and Troll regen can be made up for, barbarians have good faction but are nightblind which is not a big deal. Ogres are frontal stun IMMUNE. That can not be made up for.
Now this is what the AA ability description says for Stalwart Endurance.
Stalwart Endurance
This ability grants a chance to endure what would otherwise be a stunning blow, from any angle, without being stunned. You may train in the ranks of this ability at or after levels 61, 63, and 65.
It does not say immunity to frontal stuns. Now, it is vague so it may give that benefit. Furor, Behemoth or some other warrior with all 12 points in it can verify that. But Ogres get the frontal stun immuntiy for free, and get the full benefit of the Stalwart Endurance AA. With no real downside to being an ogre anymore I reiterate that there is no real gameplay reason to be any race other than an Ogre to be a warrior.