Yes, I think a 14" stock is probably too short for 6'3" unless you're built like a defensive lineman. I'm 6'3" and shoot a 15 1/8" lop with 2" of drop for targets. Use a slip on pad to add length, and there's similar removable things to add comb height for testing your changes.

A real gunfitting is a good thing, but you can get in the ballpark.