Katana-ASPD

Does increasing the Attack speed help while using a Katana. I am currently at level 56.

 

More aspd is always better.
Try to hit 1k since your atk will not have any delay if you hit 1k.
Combined the fact that katana has very high ampr (beaten by Dw)

 

Don't put any stat points on agi, focus on dex or str first, you can get enough aspd from giga speed pot or tera speed pots

 

Graze Is what ?

 

Imagine u r banging ur head against the wall but instead of having brain damaga u have paralyzed leg. In other word it’s a critical hit that missed

 

a hit that would have missed the target mark, but still hit the target somewhere else because it was a critical hit. (or because you got lucky with the minimum hit rate)

 

Imagine someone trying to shoot your head, but instead of your forehead, he shot your ear.

 

Oh,so graze Is because My accuracy is low
But my critical rate Is high ?

 

yes.
(and if it wasn't mentioned yet: grazed hits have their stability halved)

 

Different detail skill magadachi and zantei Is what ?

 

When you say katana has a high ampr, are you including shukuchi in the equation or are u saying that katana has a way to achieve high ampr generally, without the use of shukuchi? I hope this question make sense

 

most likely with Shukuchi. katana's unique dash moves make it easier to use.
the other ampr buff would be Kaikiri.