5'6, 140lbs - best areas for lipo for breast fat transfer after explant?

It is always better to wait for the breast to settle down and do the fat transfer later. However, the amount he has planned will probably work well.

Delivering consistent quality results with both Liposuction and fat transfer is more difficult than most people realize. A substantial number of plastic surgeons despite being board-certified and having overall good reputations are not particularly talented at either one of these two procedures. A substantial number of plastic surgeons don’t take liposuction seriously enough to bother attempting to master how to do it well.
Liposuction results very dramatically based on who does the procedure and results are permanent and more or less irreversible. patients should be very selective before committing to having permanent and irreversible cosmetic procedures.
Anybody interested in liposuction and fat transfer should have multiple in person consultations with local board-certified plastic surgeons. During each consultation ask each provider to show their entire collection of before and after pictures.
Seeing a handful of pictures which must likely represent the best results of the providers career is insufficient to get a clear understanding of what average results look like in the hands of each provider.
An experienced provider should have no difficulty showing you at least 50 sets of before and after pictures of commonly performed procedures. if your surgeon is only going to graft 80 cc then that amount of fat should be easily obtained from any one area without causing a substantial change in body contour. 160 mL fat is a tiny amount to be grafted regardless of what size breast someone has.
My average breast fat transfer is closer to 500 cc per side.
The least I’ve ever grafted is 200 cc and the most has been 1200 cc.
The biggest problem with fat transfer at the time of explantation is that patients have no way of assessing the outcome of the fat transfer.
Your breast will not look like they did pre-augmentation and without recovery from explantation before grafting you have no reference or before and after pictures.
If you want to have fat transfer you should probably find a plastic surgeon who has ample experience with a proven track record of getting quality results on a consistent basis with that procedure. there are advantages and disadvantages of grafting during explantation. The major advantage is the surgeons access to the ability to graft from inside the breast towards the skin.
Breast fat transfer results even when done correctly are still fairly subtle and typically do not deliver more than 1/2 cup increase in breast size.
Fat transfer also does not change the shape of the breast in any particular manner simply increases the volume.
When in doubt I suggest patients slow down and have more consultations to make sure that they found a most talented and experienced provider for their needs.
This is especially true for procedures that are permanent and irreversible.
Best,
Mats Hagstrom MD