Billy,
At least you can now put it back right. That boat originally never had a below deck tank. I cant believe all of the work went bad ion only 4 years. Makes you wonder about the transom too as it seems to have been raised 5". Anyways I have the same stringer setup but you should build up your 3" like strick did and foam fill the stringers while you have access.
http://www.casdvm.com/photos/20sf/DSCN5275.JPG
http://www.casdvm.com/photos/20sf/DSCN5320.JPG
http://www.casdvm.com/photos/20sf/DSCN5324.JPG
I think if you want to pour foam back in at this point I would stick with the outside bays only....someone else may have an epinion on this.
Looks like your on your way