Fiora buff makes no sense
"Giving Fiora more strength to capitalize on momentum she gets from a lead in lane."
Why buff her early/her snowball
She's a late game anti-tank/bruiser champion. Just facilitate the game in a way that late game isn't impossible to reach without changing fiora at all.

with some quality of life changes? "Capitalize from the momentum she gets from her lead" aka, hitting 10 vitals that spawn right next to her and killing you because of RNG.