PU Implant edges turning up and palpable - pocket too small? (photos)

I had my first BA last year, 315cc submammary, anatomical PU implants. I am very happy with my RHS, which feels part of my body, but my LHS has not felt natural since day 1. I can feel the edges of my implant easily on this side & even underneath it to my thorax, when I bend over the the edge of implant comes away from my breast plate & is noticeably visible. I am conscious of this breast all of the time and wearing a bra is uncomfortable. Is my pocket too small? What are my options?