As @_OM said, this is probably the best field for addressing the meridians directly at this point (and strengthening the general energy system).
The Three Treasures and three Dan Tiens (Soul Restoration Series) are always an excellent foundational place to begin for one’s physical, mental and spiritual harmony, though do not necessarily address meridians in specific detail as Mana Circuits would.
(and yes, ‘spirit’ would apply to what the meridians and Three Treasures affect. )
Feel like Full Body Negentropic Coherence from the Mythic album would help as well.
1-2x per day is probably plenty to begin with for the Negentropic Treasures in your situation, but see how you go with them. Once may even be enough for each of those.
For most fields, the usual 2-3x is well balanced.