They are missing the point i know they are trying to help but its not really what the cars need, and no i am not an areo expert.
But surly go back to slicks, ban the flip ups, lower the nose again. Alot of the problems as well is that no only do designers look at the best areo they also look at disturbing the air behind the car, so make a standared defuser as Triple M said.
The problems have happened since the FIA started messing about with hights of wings and body work without fully caring out tests. Sliptreaming never used to be a problem watch 1989,1990,1991,1992,1993,1994,1995,1996,1997 then look what happened.