Low pressure means it is close(r) to separation?
The radii on the front will be good. I would look at the usefulness of the interior volume and see if the windshield plan curve works with it.
And the wheels on your model are in a very different situation than the wheels on the Ferrari. I think that the 15 degree angle is an outward flow, not inward? Which is good, and this is the reason why the back is tapered in.
Have you seen the 4 wheel designs by Jason Hill?
If the rear wheels are at least partially engaged, then the strakes do not have to be this large, but the basic idea would help, I think?