Please, I need to craf an Alpha for my StJ/FA brute... Clueless

I got ageless T3 and Consume, IOs procs, Accolades, so endurance is not an issue. So I would leave Cardiac out... The resist damage is nice though.

I dont need more recharge. Healing flames is up very quickly... Dont need Spiritual.

Should I go Agility, Vigor, Musculature?
Please help, I got T3 of every Incarnate power but got not Alpha because cant make my mind.

Generally, an Alpha is built to offshore any potential weaknesses the build might have (even if it's minor). If you feel you have no such weaknesses, then use the Alpha for extra strength in resistances or damage, such as Resilient or Musculature, based around the major buffed part of the Alpha and ignoring the side boosts from higher tiers (but still building to tier 3 for level shift). Alternatively, look at all of the boosts as a whole and see which would help you most, like Agility for endurance mod, recharge and def buff (and movement if you go radial), or Cardiac for endurance reduction, resist buff and range (if you took an epic pool with range attacks).

FA loves Spiritual, but I see that you are against that idea, and I assume you will take Ageless to tier 4 at some point anyway.

I guess I would go with Ideon's suggestion of Resilient or Musculature if you already have endurance and recharge issues already resolved.

I think Ill go Agility.
More Recovery, more recharge and more defense cant hurt anyone
So a mix of nice things will cover possible holes.