Its hard to 'fix' good results
and you do have good results especially when you consider where you came from. Time does change things, usually in a detrimental manner and I would suggest you wait until they occur and really emphasize what you want with your surgeon when you have your next procedure.
Breast lift and augmentation
I think that you have a nice result, but if over a years time you feel they are descending too much, then perhaps a small revision to tighten the s kin envelope may be necessary. Sometimes the skin rebounds a bit and loses elasticity with time. This can not be controlled by the surgeon.