Driving lofted bend thickness..with equation, annotation

What i want to do is to drive the thickness in a lofted bend part by an annotation in the assembly level. so adjust cone thickness in sketch1 assembly level, rebuild, and cone thickness updates.

In past versions i know i have been able to do this, however i can not get it to work properly.

It works but does update with out toggling in and out of lofted bend feature in the part level. As soon as you edit the lofted bend feature the thickness updates.

anyone know of any settings to help, or know what im doing wrong.

SolidworksSheet Metal