Does this fit right?

Hey guys! I’m pretty new to the corset world but I’m thinking of buying a new one and trying to decide if I should size up or not. I’ve linked some photos of one I bought about a year ago. I followed the seasoning process and this is kind of how it ended up. If I want less of a gap in the back, should I size up? Or would that affect how it lays on my hips and such? Any advice would be appreciated!! 💜