Well damn that's a nice build!
Honestly the 16th's were really kind of boring me reading about until now. This has truly gone from just slap a big motor in there to something of much more inspiration.
I really like the look with the body and wing but agree with PBO on the changes. I think in your case he was saying that stabilization is more important at this point than downforce. As well too much down force on the rear can cause the front to lift as well.
On another note if I was you I would get some more of those chassis made and sell them. I am sure you could turn them over pretty quickly.
As far as the diffs go that will be interesting to watch. Maybe linc will find a way to fit LST2 diffs in the mini revo as well.