To me all necks should be of a late 60’s 70’s U shape and I don’t have large hands, I just enjoy necks with lots of shoulder that fill the palm and makes a comfortable grip for the hand eliminating cramping. Skinny necks to me equals cramping.
I’ve never played a 59 reissue Les Paul but I have a 57 reissue and I’d say that that’s the closest a Gibson will come to feeling like a fender U although fenders usually tend to feel just a little less substantial
Small hands here. Would love to see your hand position. Wondering what I am doing wrong. Could you post a pic.