Try some slicks, some 31mm wide wheels/tires or some competition rated tires.
Slicks would require the least modification as you could mount them to your current wheels.
Going with 31mm tires you'll have to get the right offset, get new hex hubs or a new body for them to look right.
Competition/racing tires are pretty much all 24mm thes days I think so again, you'll need new wheels, and have to worry about offset if you want them to look good.
Or you could try changing your shock fluid and springs and alignment. It's amazing what a properly tuned suspension and alignment setup can do for RC cars.
Adding some sway bars from an old RS4 is also an option as the new Sport 3 will fit them front and rear.