As above answer but there are set back and extra set back in the Rowan series, for example.
They can make a useful difference to fit and feel.
But if you get one set too far back, or unnecessary in the first place, they can spoil the handling.
I found extra set back worked well on an old HW35, whilst it ruined HW97KT synthetic, so I took it off.
Set back works well on 97KT in CS700 stock. My old HW80 doesn't need any set back at all.
I've got average sized hands.