This is a very tricky one and depends on the person, personally I know I have to play a 125-130g shaft in my irons and usually the 130 DG feels better to me. But I have always played D4 swingweight as well. When I made a grip change to a slightly smaller grip (2g lighter ~ 1/2 point) I had to make the swingweight back to D4 to make the feel the same to me. Some people feel the total weight more some people feel the swingweight more.