Was busy with the GF yesterday, but now's the time for some responses:
I might lean hard into the psykic side of things. Make a psyonik who's got all the most psykic stuff. Because they're psykic. Only problem there that I'm noticing is some pretty serious reliability issues if I try to go down that route... anything I can do to balance the two points out? (Also, to wit, I assume having a stat at or below 0 is mechanically inviable and/or in-universe Bad.)
I think I answered this one in PMs but: Due to the fact that the stats so far aren't complete, there's gonna be additional subsystems for improving REL and ARM that haven't been showcased yet. So the stats you get for theorcrafting so far aren't indicative of the final result.
My idea is, if you're willing to work on lore elements, someone who belongs to a warrior-cult that worships the bond between man and fighting vehicles - non-Juggernauts included, but since those are the ones who get inhabited by intelligences, they're special. They practice a weird combination of asceticism and car tuner culture where they do keep possessions, but only as long as it takes to sell them to fuel maintenance and improvement of their personally owned craft. They live like monks in the desert, but their rides are wondrous things.
I'd even go as far as to say you could spin this off as a specific sect of Azvanrism that's mostly around warrior castes in certain systems. There'd be totems and lesser deities in Azvanrism to things such as mechanical and physical concepts - think of there being "Patron Saints" of things like fusion power, engines, etc., all mixed in with natural forces like wind and cosmos.
If that's an angle you wanted to take this, i'd see it being justified. If it's supposed to be something completely different then I'd just need some more to work off of.
Ok based on this, I think it makes sense for my character to not be a keeper, which is totally fine. I'm going to assume that based on the sheer size of the galaxy, that it would be impossible for Azvanrism to me monolithic? So I could have my character practice a form of Azvanrism with its own 'flavor'?
As with the response above: Yeah, the Sirian Empire was just too damn big to ever allow Azvanrist thought to be a monolith. It wasn't for lack of trying; There were several attempts to try and consolidate the faith under one universal train of thought, but every time it ended up splitting because there were just too many sects out there.
Azvanrist thought allows a certain deviance from some core tenants, but other than that due to its diffuse nature the central Perriarch of Azvan has been more of a guiding figure than a super-authoritative "my way or the highway" type. Think of how Hinduism and Buddhism have several different denominations but are still generally unified under the same founding guidelines.