Do you think infraorbital rim implants are my next step?

Generally, I reserve orbital rim implants after complications for surgery.  One milliliter of filler is unlikely to make much of a difference on your orbital rims.  You really need 2 to 3 ml of filler on each side.  Still these treatments are likely to last one to two years.  My personal recommendation is to stay with the fillers if they are working and reserve the surgical methods for a time when the fillers are no longer getting the job done.

Your question is a good one as both fat injections and infraorbital rim implants can be used for the exact problem you are describing. Each as their own distinct advantages and disadvantages. Fat is simpler to do and has minimal recovery but may develop lumps, partial resorption and may need to be repeated. Infraorbital rim implants require a transcutaneous lower eyelid incision, have more recovery and must be carefully placed and contoured to avoid any edge show or asymmetry, but they provide a one-time permanent solution. You have to weigh the risks vs benefits of both procedures to consider your next step.