Dale, have you put any of your bodies into a wind tunnel? or attempted to measure downforce? That would be fascinating data - what front and rear downforce is generated at what speeds.
In offroad (EP) A few years ago we were playing with mounting wings directly onto rear hubs so that any downforce wasn't interfering with suspension. The team we were running for at the time said they had tested and found that offroad wings generated no downforce, just what they called "stabilising drag". We put out experimental wings away in the cupboard and went back to suspension tuning!