Upon looking at BAS closer, it really does seem quite OP as I suspected (in my battle tests, it was skewing results insanely)...
I added the caps in -10 to 25.
Also, per the game guide:
https://thardferr.com/guide/chapter-5/
"Also note that the defender BAS bonuses are doubled."
I have added defender BAS is doubled.
This thread had a good outcome... Also, screw the humans lol :p