Item Grades

I know this was discussed up above but i couldn't find a reply link to ask my question on it. So how do i get the S and X item grades? i have gotten the A item grade which is pretty handy on the light armor which i made for another but i kinda want the S and X item grades as they look strong especially with the +1 special on them.

You have to have a high enough rank and do the minigame very, very precisely.

any advice on how?

Uhm... Can't really give advice on a pretty straightforward minigame.

so does the remianing time matter or just how precise it is to the center of the square and the middle of the X ?

Precision. Time doesn't matter.