Physics behind front wheels of a car going upwards during acceleration going uphill vs downhill

I’m playing a video game right now for which cars have sometimes access to a temporary boost for acceleration, however when you use it at low speed the front wheels goes upwards and you then lose control of the direction which is obviously bad. It got me thinking about what if I can use it uphill or downhill and which is better and it turns out that in the game using downhill is worse than uphill but I don’t understand why.

I’ve had a few years of physicis and engineering science in university and this is what I make of the problem: 1. Assume that the acceleration is done only through the back wheels 2. The car front wheels goes upwards at the moment where the torque generated by the weight of the car around the back wheels is less than the torque generated by the acceleration 3. However, from the same given non zero angle, be it up or down, there is less torque generated by the weight of the car so my conclusion is that no matter what using the boost on a slope is bad; however it’s not what I observed.

I know it’s just a video game and not a realistic simulation but I still think I’m wrong and I don’t get where