Revision breast implants
Without seeing you in person it's hard to make a recommendation. If recurrent capsular contracture is the issue, then in my opinion, it would be better to either make a new sub muscular pocket between the old capsule and the muscle or take the bottom of the capsule out and replace it with a piece of Strattice. By visibility, I'm assuming either seeing the edge of the implant, or seeing wrinkling both of which would be better masked when implanted under the muscle. Good luck with your upcoming surgery.
Going from under muscle to over muscle.
Generally the approach to capsular contracture is a new pocket and implant placed under the muscle for the lowest recurrence rate. Many will also recommend an allograft material such as Strattice to help interrupt a new contracture. A high profile implant over the muscle even with texturing has a lower sucess rate and might show through or appear round.
On the balance, it is more common to replace implants into a new pocket under the muscle rather than over the muscle. That may have something to do with why you are finding it difficult to locate information about this surgery. My guess is that your new surgeon is concerned about contracture so the recommendation is for textured implants in a new position. That is a reasonable suggestion if I am guessing correctly. Good luck!