I've found that Out of Sight is more than enough, and we've even begun to replace Out of Sight with another affinity trait when we do Ifrit.

Zdenka is not one of my linkshell's members, and I don't think his findings are conclusive to the point where I can recommend STR over ATK or ATK over STR.

For DPS, Penance is still the strongest choice, but a Peisteskin Hunting Belt with +70 HP is a nice little bonus for those who, for whatever reason, want the extra HP.