Awesome setup!

One idea you may consider as you redesign your splitter. Although its illegal in most racing organizations, you can make a venturi under the front axle. channel the air under the car and squeeze it under the front axle. this rush of air will make down force.

you will notice that some cars have a splitter that is slightly higher in the center and even canted upward to push air under the car. Seems counter intuitive but it works.