7 months post breast lift w/ implants. Can my scar be moved so that it sits in the crease? Am I bottoming out?

I think you are right one side may be bottoming out slightly. It sounds like your surgeon should be well equipped to manage this issue which is not uncommon. He is likely to revise that side which should involve Reinforcing the soft tissue on that side so that it can hold the weight of the implant.

Your implant has bottomed out and dropped below the fold. This can be corrected. You might need an internal bra for added support. Sagging breast tissue does not hold well for long term.

Yes, your right implant is bottoming out, meaning that your inframammary fold structures have been violated and your implant is falling down below where your breast should end (assuming the scar was in your fold to begin with). This can be fixed, with repair of the inframammary fold structures and likely the use of an internal mesh bra such as Galaflex. This is typically successful, but there is always a small chance of recurrence of this problem. Best of luck!