Don't worry about it for a first playthrough I barely had all 6 stats at level 68 (after beating Nibelim) barely at +60.
Hence its just best to use the stolen tutti core off of Nibelim for +50 levels to get the +200 for Combo + 4.
I'm nearing the end of my first playthrough and only the attack stat that I'm lacking to reach it to 200. The stats do carry over, right?
No, they don't. However, you can carry over capacity cores to make the stat growths go much faster earlier in the game. If you can get Tutti in your first playthrough I would definitely try to get it because it will make getting all of the AD skills much easier in your next run.
Keep in mind that healing goes off of a percentage of HP and isn't affected by fAtk, so +fAtk is useless on Natalia(besides MAs) if you already have Speed Cast, Magic End, Reprise, and Reducer.
This is just something I like to tell people who are on their first playthrough because its not obvious.
The sad part is that Speed Cast, Magic End, Reprise, and Reducer are all very important in order for Natalia to be a successful caster(or any caster really). But for Natalia fAtk is basically a second Enh stat that only affects her Mystic Artes.
Its not all bad, though, because if you already have those skills then you can focus more on giving her defenses(as keeping your healer alive is very important).
That is if you're using Natalia at all, though.
Also, if you don't have Tutti, Lunatito, or Grandioz I would recommend looking up how to get those before starting a second playthrough. Sometimes swapping Tutti can get annoying(if you're planning on swapping it, that is), and its always good to have Lunatito and Grandioz as backup. --- "It's not working. The banana is not melting." -Masaokis