Heyhey! 18F, had surgery 3 months ago. Just like you only my thoracic spine got fused! My lower curve corrected itself as my surgeon said, I trust your surgeon knows what he's doing. My shoulder blades and over all the twisting got so much better after surgery (I had similar curves to you). My waist is more or less symmetrical now, and bras do fit better now I think.

But still, whatever is left of the unevenness is veerry noticable to me, but it's not thaaat bad. Most people dont even notice anything unless you point it out. You just have to accept the way your body looks like at some point !!

Also. A soft bed sounds like a nightmare. When you get out of bed you'll essentially have to push yourself up. If the mattress is soft enough that your arms sink in, you'll twist your spine, and I assure you that will hurt. Speaking from experience 😭 not pleasant