Nah, rake won’t affect accel–unless you’re talking a really, really long straight and even then, it’s not going to be a very big margin.
BTW windshield thing. I didn’t illustrate this, it’s from another site:
FWIW not the same application, but scale hobby rc cars (lol yes, i went there) have been aero testing bodies with different windshield locations (ie: cab forward vs cab rearward), and the difference in downforce + how it is applied to the car is yielding a big difference. But anyway, my note on lowering the car had to do with reducing the air going under the car. Less air under there, less lift. Also, if less air is going under, it means more air has to travel over the car - this is where i went into the whole windshield thing.