移軸鏡... don't touch that... unless you are professional architecture photographer, otherwise, accept the fact that wide angle lens, wider than 35mm or 20mm, will have the deformation. Accept it, enjoy it, and control it.
To be honest, the last one is very important, if you can control it, if you remember, years ago, those "big head dog" photos, so many people love it like crazy. Who said deform is not good? It can create something that you don't normally see. That's what it mean by "control". Ultimately, photography is ART, not just a copy of what you see.