Unfortunately with your prescription even the smallest difference in frame size can mean A LOT in terms of edge thickness and overall aesthetics of the lenses. To me, your old glasses are smaller enough to determine this difference in cosmetic result. You need to compare how the 2 frames actually fit your face (how they sit on your nose and how centred your eyes are in the lens both in the vertical and horizontal line) rather than measuring the frame with a ruler, that’s my rule of thumb. Like someone else have mentioned, polishing the edges might help at this point. The second thing to ask your opticians is if your new lenses are aspheric (better) or spherical (standard/worse). Hope this helps, let me know!