*sigh*

Okay, first of all, Armor seals should be flat, not per level. The reason being that scaling armor only exceeds that of flat at level 10. That means it takes around 20 minutes for scaling seals to be effective.

The reason you don't get scaling AD Marks is because you need flat AD marks in order to last hit better. It takes 8 levels for scaling to exceed flat, by which point you really need to have gotten good farm on. In addition, Fiora experiences a power spiked at level 4-6, meaning the best Marks to take advantage of this power spike is flat and not scaling. By level 18 game, you don't need the extra 10 or so AD anyway. It's much more preferable to take flat AD early and secure those last hits and build up AD items quicker.

Scaling Magic Resist is fine, given most (but not all) matchups.

The Quintessences are essentially the same reasons as the Marks. That extra 7 AD isn't really worth much in the grand scheme of things and it takes 9 levels for scaling to exceed flat AD. Again, you've missed the power spike already. Also easier to last hit.

Runes are primarily to give a strong advantage earlier in the game and not later in the game. The stats are relatively more miniscule the longer the game drags on. Therefore, you should take advantage of the powers of runes as early as possible. There are some exceptions, but not many.

Because 0.91 AD > 2.43 AD.

If you did some basic maths comparing scaling runes and flat stat runes, you'd quickly notice that your runes are wrong.

I've tried her with flat ad, armor pen, atk speed, literally every combo of runes and masteries I could think of and this one works the best. The problem is Fiora's kit is unfinished. It's like they needed to put out another champion asap and just tossed her out while still in development or something. The fact that her W gives 15 ad at level 1 makes up for the scaling runes. But because most of you're enemies will start with high armor or an armor item having flat ad at the beggining doesn't help as much because more of it will be blocked by the armor. Armor pen could work but with LW and BC you lose the point of them later on. Scaling runes reach the same amount as flat runes by lv 7 and lv 7 is usually when I go back and buy my LW any-who so that's why I take them. I don't have too big of a problem winning my lane usually, I simply meant when new to Fiora and when fighting very experienced players or a pantheon its very very annoying.

Your early game masteries/runes are completely non-existent.
And then you complain about how hard it is to win as Fiora in lane.
I'm not going to downvote but I'm pretty sure that this would be your problem.