Nope...you're not nutz....well, if you are - so are we!
We thought ours (on '64 GT) had a different grain/texture on them then the flat panels too. Must be something in the forming process that changes the surface...which makes sense if you think about it. We eventually got the corners to shine as well as the rest...but not until several extra passes compounding ~
Haven't polished the '56 yet to see if it's the same...
Couple more passes and you'll be there...looking good now!
Shari