Can I change from dual plane to fully under the muscle?

When plastic surgeons say "Under the muscle" is essentially means dual plane.   I recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with.   Finally, make sure your surgeon is a Double-Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery (ABPS), a member of the American Society of Plastic Surgery (ASPS), a member of the American Society of Aesthetic Plastic Surgery (ASAPS), and a fellow of the American College of Surgeons (FACS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified, Double Fellowship-Trained Beverly Hills Plastic Surgeon

No, changing implant position to complete sub-muscular is not likely to successfully solve your issue, and may introduce problems you don’t now have.  Recruitment of serratus anterior muscle to completely cover implants was long ago abandoned for good reason.Consider addition of substance over your implants such as fat (grafting), acellular dermal matrix (Alloderm, Strattice, Belladerm), poly-L-lactic acid (Sculptra), Galatea absorbable mesh, and/or a more cohesive gel device for more suitable consistency.