you’ll want to pick up Confuse, it’s one of the primary reasons to pick Mind as a dominator set
slot Psychic Shockwave for damage. psi is already quite a low damage set and you’ll want to get all the help you can. i’d recommend 5 slotting with armageddon including the damage proc but excluding dam/end and then put in a second damage proc
the purple confuse set is best placed in the ST confuse power, the contagious confusion proc is effective. 5 slotted works fine
a purple damage set in world of confusion is not worth it in my view. i would always choose ice mastery too, it has defender strength sleet which is a great debuff for -res and -def
overall, said in a supportive way, i’m not quite sure what this build is trying to do. is this a character you’ve played to 25-40 yet? working it through the games content will help you explore what kind of set bonuses and powers work for your playstyle and needs
i’ve tweaked my mind/fire/ice dom a fair amount over the last 4 years of playing it, the various team and TF experiences have helped inform what works best for me