Should I have my 800cc silicone implants removed? (Photo)

See a surgeon certified by the American Board of Plastic Surgery for recommendations and a full exam to determine if implant removal will help your pain. I do believe those implants are too large and will only worsen over time. While going to 500cc with a lift sounds reasonable one would need to examine you and go over you concerns before making appropriate recommendations. Best of luckJosh Olson MD

It is certainly feasible to #downsize to smaller implants and also alter the positioning; if possible. However, decreasing is size may also require a Breast #Lift to to #tighten loose skin, better optimize the end result. Any #revision has risks of unhappy outcome or other complications. Also, the right implant for the revision is contingent on shape of body and your desired outcome.

There are many different options in your case.  I would remove the implants and perform the lift as the first stage.  Then you would be able to decide if you want implants at all and what size.  Trying to do it all in one stage is unlikely to give you a good result and there would be an increased incidence of complication.