I wouldn't really pay any attention to DEF tbh. Focus on spd and cdmg, with 100% CR of course. His a2 scales on enemy max hp. At a certain point I guess cdmg falls off and you can start putting some points into def, but honestly I doubt you're in a place where that'll be a factor. Speed is by far his most important stat.

What about Res?

Where you wanna use him?  I'm guessing Hydra so figure out the accuracy of the heads for your level then go from there.  Can also assume his increase Res will be up full time on himself.

He is tanklike so wasnt sure how important Res would be.  I am aiming for 250 spd, 100 cr,  250 cd and 275 acc.  

His Res buff is 2 turns on 4 turn cooldown.  My goal would be 360 Res but not sure I have the gear to hit all the stats.  Trying to decide which stat can be less if necessary. 

Poly, you pulled Graaz? Congrats and also I'm jealous. Lol

2 turn on a 4 turn CD but then he immediately extends the buff on his next turn so you get consistent uptime on it.  Of course more is better for consistency but only so many stats to go around. 

This is old news.  Have you been sleeping on mod duty?   :)

Q is busy cursing her snow laden holidays.

Bah humbug to Q.  Only the Grinch would curse a white Christmas.  I will take that over a green yard any time.  

Quinch hates snow.  Can only be satiated with an IV drip of cold brew.