Submuscular to subglandular breast augmentation revision. Increase to 700cc implants

Without photos there can be no specific recommendation for you, but I can tell you that your animation deformity is most likely due to either a mismatch of anatomy and implant dimensions or the potential need for a breast lift that was instead addressed by having your inframammary fold lowered unstead, or both. Changing pockets and going bigger will not only increase your risk of rippling, but also capsular contracture. If you want a specific recommendation for you, you'll need to post photos of your before and current, or better yet, go on some in person or virtual consultations.

I do not recommend going up to 700 cc's, especially if you want them sub glandular. At that size, they will just stretch your own tissue and sag. I would suggest going smaller to decrease the sag potential. For long term, submuscular is still best. It helps support the weight of the implant and hides it nicely.