I think there is a bit of variability on '54's alone. I have a real ball bat of a 54 RI. Then I have a '57 which is still thick, but a little more graceful going about it. Then I have a 59 RI which is "the perfect balance". You would NOT call it thick, but definitely not a skinny ES/SG of later years ilk. So I suppose a 58 would be a touch more graceful yet.
Not what you asked but as close as I could get...