I don't know much about fibrosis or Peyronie's disease, just that fibrosis is when you have an issue with excessive connective tissue, and Peyronie's is when it's related to the penis. So if you don't think that's what it is, then your issue may be in the ligs.
Curvature can happen when one ligament is longer than the other I believe, which will in time be corrected by doing proper length work.. And I believe [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extenders[/words] are supposed to help that as well, if your issue is in fact in the ligs.
By "hourglass deformation", do you mean your girth is larger near the head and base, and smaller in the middle? I don't think I've heard of that