I'm basing the aero theories on my own experience with my Rustler
Sorry, I'm being lazy by just posting pics but I think you get the idea. The rear wing is a BRP Super Wing & the forward splitter is a 1/10 TC rear wing...my initial issue was to stop wheelies, then blow overs, then straight line stability. My set up generates a lot of frontal downforce, which solves the first 2 issues & my rear wing is more for extending the cord length of the vehicle which smooths the airflow exit around the transmission & motor & it also provides a mounting position for the vertical stabilizers. These are important to help the vehicle track straight at all times
All that being said, aerodynamics is extremely complex & everyone has their own theories. I'm about to work on my truggy which has similar issues to the 1/16 revo. I'm hoping a small forward splitter with a low downforce rear wing incorporating vertical stabilizers will be a good starting point