The weight of the engine does that and the air hitting the front of the car. The bumper does create a bit of downforce and the engine weight helps. The back however just lets air flow off it. The BGW is a precaution to lessen the chance of spinning out. I've been watching many videos and it happens a lot.
But "if" your wing works, you are pushing the back of the car down, so unloading the front, so how do you intend to get that balance out that effect?
That's assuming the weight of the downforce on the rear exceeds the weight of the front of the car. What I'd hope to achieve is equilibrium.
I've never considered aerodynamics before because I'd never planned a track day. So that's why I'm asking.
I appreciate what you're saying but don't understand why you're trying to answer a question with a question. As you're obviously more clued up than me, you could answer the question instead of trying to berate me for asking it.