2 times amygdala is fine.
Regarding your first chi question, I’d say “why not?”
But this is also connected to your second question about chi and here, all will depend on your personal system, needs, priorities, reserves, etc.
You may want to read at least pages 6 and 7 in the PDF posted by _OM, to have a better understanding of their interconnections:
https://forum.enlightenedstates.com/t/soul-restoration-and-three-treasures/4361/15