It's too light!

[Imurg]

My 4 wood, that is...
Callaway X2 Hot with an Accra 60g shaft and a New Decade grip
Compared to my 7 wood (Big Bertha with 69g shaft and ND grip)
Both are swingweighted to D2 and, admittedly, the 4 wood is 20g lighter in overall weight.
But when i swing them, i can 'feel' the 7 wood all the way through but as soon as i move the 4 wood away it almost feels like there's nothing there and the swing gets out of sync.
Mostly i can get it back before hitting the ball but sometimes it doesn't happen.
Is this simply down to the 20g difference in static weight?
Coz it feels bloomin' wierd..!

 

[clubchamp98]

My 4 wood, that is...
Callaway X2 Hot with an Accra 60g shaft and a New Decade grip
Compared to my 7 wood (Big Bertha with 69g shaft and ND grip)
Both are swingweighted to D2 and, admittedly, the 4 wood is 20g lighter in overall weight.
But when i swing them, i can 'feel' the 7 wood all the way through but as soon as i move the 4 wood away it almost feels like there's nothing there and the swing gets out of sync.
Mostly i can get it back before hitting the ball but sometimes it doesn't happen.
Is this simply down to the 20g difference in static weight?
Coz it feels bloomin' wierd..!

Im no expert but I would imagine 20g static weight is multiplied by the centrifugal force of your swing this would make the difference feel a lot more than 20g.
normally would expect a 80/90g shaft in a 4wood but light shafts equals speed but loss of feel imo.