A deep plane facelift can cause more swelling that takes longer to resolve . By 12 weeks post op 95% of this should be resolved but can take up to 10 months for final result .
Usually it is impossible to remove 100% of injectables, even with a deep plane facelift.
Scar tissue will always be an issue and yes, it will become softer over time, but it always could cause dimpling or irregularities, hopefully it will become less noticeable over time.
Keep in touch with your doctor and give it time, seems you are doing all that is possible at this point.
Dimpling and asymmetry are normal after facelift and usually resolves in 1-3 weeks. However, you may still be able to feel deeper swelling/ irregularities which are not visible and will continue to improve. Follow up with your surgeon to express your concerns.
You apparently had a significant facelift complicated by removal of foreign body. Expect contour and expression issues to persist for months as swelling will be lingering.