So, Invisalign is switched every two weeks to the next Invisalign retainer.

Your dentist or orthodontist probably has not had many in this category so not much for backup.

What if you wore each retainer every 3 weeks instead of two?
That would give the teeth time to settle. But they would be moved a little bit again with the next retainer.

There must be something natural to take to ensure the bones settle well.
Contact the company so at least they would be aware of this issue and may have had someone with this situation.

Make sure that you are taking vitamin D + K2-MK4 to get calcium to the bones and teeth.