well the increase in max HP/MP helps the sader since his buffs get stronger with the more vitality he has, so you can go for that if you like.
i would drop deflection wall and pressure wall, your only attack skills should be spear to mob enemies for your party and blades of purity is optional.
cure is optional, but its pretty useful at times.
also, slow heal upgrade with level 10 slow heal...what? max it if you're getting the EX