Heyo,
1. You are correct with the first assumption that both enemy lvl and ranking alongside the units you bring determine the score you recieve. After playing a few matches I also observed that if any of my own units died I would get a lower score for the battle.
2. I'm honestly not sure on this one. Maybe it takes into account the boon/bane IVs? Don't take my word for it though.
3. I think atk up def down might be better. You get two hits in before you take dmg due to Brave Axe+. Speed wouldn't do much good besides prevent her from potentially getting doubled when attacked, plus her max speed [with spd+] is 30 which is commonly outsped. Also take into account that there are many Takumi's and Red units running around it's hard for her to survive a hit. That's why I think it's preferable to have atk instead - you kill a Blue or Colorless unit then die lol. If you're using her mainly for PvE then either one should fair well.
Hoped I helped a bit.
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Fate Grand Order
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