The picture did not make it to the post, but I think I understand your issue.
Given the constraint that volume from the direct DLY to chain output needs to be at 100, you will need a Thru algorithm to control the volume from the DLY to the RVB, unless you use one of the 4 to 8 channel delays that have volume controls for each channel, such as #516 "Eight Delays", in which case you could do something like this.
