Let me just say that when you find that combo of length and SW, or heft, that fits you, you'll not find another 1/100 golfers that it will work for!
I play 46-46 1/2 drivers @ around D6 SW. And out of the 14+ times I will hit driver per 18 holes, I'll have 10-14+ of those hits centerface. If I play shorter drivers, I'll maim players on the hole adjacent to my right.....slice!! And I've gained a few yards in the past couple years since adding the length. Of course; they go straighter.
You are going to get many and varied responses to the question, but you're going to have to do the experiments, and they can be costly/time consuming. There is no correct answer from 1 player to the next. imo, it's an individual thing.