Why not see what
https://www.competitivecyclist.com/S...ulatorBike.jsp says about bike size for you?
Also, you can have someone take photos of you on your bike and crop out your head.
Given that what you've tried out hasn't worked, I think you need go back to the basics, and to get good advice from this forum, you'll need eaither measurements or photos.
I have a hard time believing that a 50 CM frame can't be made to fit pretty well if you're 5' 3". If you really need a 54 CM frame, that means your torso is unusually short, and you'd have to stretch out pretty far, even on a 'women-specific designed' bike.
Numb hands means physical ailment (carpal tunnel syndrome caused my numbness) or too much weight on your hands - from a down-tilted seat, seat too close to bars, straight elbows, weak core, etc., etc., etc.. Without photos, though, how can anyone tell?