[neil]

Offset (hosel more in front of the face) in irons give the golfer a split second longer to square uop the club face. It can be slightly helpful. When used in conjuction with a closed face angle in woods, it can show measurable difference in those that seldom see the left side of the golf course.

Offset irons also move the clubs center of gravity back giving it a higher moment of inertia (less head twisting and higher ball speed on off center hits). The amount the COG can be moved back in irons is minimal compared to woods. Moving the COG back also produces a higher ball flight. Again, it has more effect on woods than irons.

What you have is a different animal in you hands: different head, shaft, grip, swingweight, total weight, lie angle....
Only through experiment and experience with the new stick can you find the right Aiming Point for you. If you have the book read 6-E-2.

My suggestion is to go with what club works best base on proper fitting technique.

Wouldn't offset also put the sweetspot out of line with the shaft and therefore have some effect on the rate of clubface closing ,particularly with swinging?