To be honest, if you’re running attack set with defence and HP modifiers, it’s about the same (when they are gold and maxed) as running a defence set with attack and HP modifiers or HP set with attack and defence modifiers. So the only change would be to double up on attack boost (to make him hit hard) or defence boost (to make up for his weakness)
As for the rest, I would just start with as many golds as possible to increase the set bonus. That imo is more valuable than a bronze or silver mod with a particular skill.
Impair resist is useful as you’ll be hitting blues. AP down is always nice. Stun resist because you probably run him against ranged teams. Agree that attack vs blues is probably not the best use, maybe defence vs Green or attack vs red to improve against ranged teams.