Lateral Displacement, Bottoming Out, or Both? What kind of revision might I need? (Photos)

I am just 6 months out from breast augmentation (Mentor smooth/round Moderate profile) and Benelli lift. I have 275cc in the left and 300cc in the right to account for slight asymmetry prior to surgery. I did lose 100lbs about 10 years ago. Around 3-4 weeks postop, I started having a lot of pressure in both breasts both on the bottom and lateral sides. My inframammary incision rose slightly in both breasts. From this point on, I could feel the implants bulging along my lower breast and toward my armpits. When I raise my arms, my natural breast mounds raise, but the implants stay low and move laterally. I feel as though the implants have continued to move downward and laterally since that time. I am no longer comfortable in a sports bra or wireless bra and only feel comfortable when I’m wearing an underwire bra to support the implant on the bottom and “push them in” where they should sit. I also feel my implants move around a lot, especially when bending over. When I lay down, the implants drop toward my armpits, while my nipples stay in the correct spot on my chest, although there doesn’t seem to be much tissue under them and they appear flat from above and below. I feel as though either the pocket was made too large, or that skin laxity from weight loss is playing a role in my implants moving shifting. Photos show pre-op, 1 week post-op, and current. Please tell me what might be going on and what kind of revision I may be looking at. Thank you!