Thanks for answers

I didnt have the Talent-point option unlocked.. so I couldnt open the panel to see if Graces AOE attack was P or M atk. Now I can see it. All her skills seem to use P.atk.

1) So for rangers like Grace (all skills seem to only use P.atk) - does that mean I dont need the stat M.atk? (I can focus on P.atk, correct?)

2) For ranger Grace, Do all of her knives come back to hit an enemy? Or does an enemy have to be in the line of the knife, for the damage to count?

(She throws knives. One goes straight. Others go diagonal and come back on the screen to hit an enemy. But Im not sure if ALL come back to hit an enemy, or if some miss if not in lined up.)

3) Grace's spirit attack seems useless if enemies are not straight in front of her. Is it better or worst than her normal attack for homing knives?
(With spirit attack, she fires faster and does the AOE knife throw in a cone shape. But Im not sure if the knives that miss, come back on the screen to home onto enemies. So it seems like its only good if the enemy is straight in front of you?)

4) Is there a wiki or site that calculated how much CRIT or BLOCK is needed to be effective, or that shows diminishing returns?

(I have high CRIT on Grace. (CRIT = 551 at player level 35.) Should I keep raising stats on it? Or after a certain number, is more stats in it is useless? I dont understand if the CRIT stat increases a CHANCE to give bonus damage, or if the CRIT # adds that amount to the ATTACK if it hits with CRIT status?)

Ty