Swing weight question

Last year I went from a set of Cobra S9 irons to the Burner 09. I love the feel of the burner irons but I can't seem to tell where the head of my club is in the start of my down swing. With a stock sw of D3.5 in the new burner irons and a D0 in the old S9's it seems that it would be the opposite, can someone please explain this for me

Good question. I might be the wrong guy to ask this of. I don't put a lot of stock into swing weights on clubs. What affects your abillity to feel the head in the swing would be the weight of the shafts. Compare the weight of the old shafts versus the new. In my experience the cobras are more head heavy than most due to the light weight shafts. Check into it and see if that makes sense.