The rear spoiler is maxed out for the rules. If anything, the front could be too effective. The only obvious aero thing to do would be raise the rear of the car to give it more rake, to try to reduce rear lift. Maybe try a shorter front splitter too.
Wards, I had a blade from Harrop eng to make the front bar in adjustable from in the car, but never got around to building the rest of it. Might have to go back on the to do list as well.