Does Galaflex mesh make revision surgery impossible?

I had an anchor lift with Galaflex, plus implant exchange. I am mostly happy with the result, except for the lower lateral corners of the breasts sagging and creating a boxy square shape. Can this improve on its own? If it does not improve would it be possible for me to have a revision on the just the outerside of the horizontal incision, to remove those square corners on the lower breasts? Would I have to exchange implants again? Would the Galaflex make this impossible? Thank you