What is the best way to correct inferior scleral show/lower eyelid retraction?

Personal consultation is necessary. See following website link and video for more details on lower eyelid retraction surgery. Sometimes additional adjunctive treatments are also beneficial such as under eye orbital rim implant. The goal is to reduce or eliminate sclera show with natural almond eyes results. Skype consult available.

Your photos to not show evidence of inferior scleral show.  Unfortunately, surgeons will line up to operate on you even though you are barking up the wrong tree.  I do not know if you have body dysmorphic disorder or you are merely misguided in your thinking.  What I do know is that many surgeons simply can't turn away people who want a particular surgery, even if it is unnecessary, due to their personal economics: Buyer beware. There are likely things that may help you short of getting an orbital decompression or irreversible eyelid surgery that will permanently harm you appearance.  Please be careful what you look for, you might find it. 

There are multiple surgical options for eyelid retraction. I would see an oculoplastic surgeon and sort out your options. The various materials we use are synthetic materials, hard palate, tarsal grafts and so  on. The point is, it is more complicated to answer than there is room here. Get a consultation with an expert

Thank you for the question, a photo would help in terms of specific recommendations but in general for lower eyelid retraction there are two major ways to address the problem. First, as you mentioned negative vector and mid face deficiency, one option to address lower eyelid retraction is with what is called an orbital onlay implant, essentially this is a small synthetic implant that is placed on the orbital rim and the front surface of the maxillary bone to help push the lower eyelid into a higher position. The other option for lower eyelid retraction would be with the placement of a spacer graft (hard palate, Enduragen, Alloderm) inside the lower eyelid once the lower eyelid retractors had been released. I would recommend finding a local Oculoplastic surgeon to discuss your surgical options.