I think what you care about is to have enough power to be at the limit of the grip of (all) your tires. If you are heavier, you need more power to reach at poin

I think what you care about is to have enough power to be at the limit of the grip of (all) your tires. If you are heavier, you need more power to reach at point. If you do have enough power, then it's all about maximizing grip - tires, surface, downforce and so on. More mass and more power are roughly equivalent to less mass and less power, if the above holds. Maybe even with less mass it's easier, since you can produce significant downforce with smaller wings.