255 Attack Cap

They just paired the scroll bonuses with the others, we have no way to know if they scrolled it to 255.

Would 430 attack even be accomplishable? I'd say you could do the backwards math, but this was probably done with miraculous enhancements.

I'm pretty sure there isn't a cap because I've seen a 214 attack clean rod, and it would kinda defeat the purpose of adding additional stats if you can't scroll it all the way.

+430 W.ATT??? CHRIST. And dem stats...wow additional options i want you

Most of the attack is from MEE's and not additional stats. Although additional stats can give a lot of attack, case in point :

 Spoiler

They can also give %boss damage (I've only seen up to 10), %allstat, %total damage.