Hello

For me problem is solved, but if it helps, here is what I get in Daz Studio when I import object from MoI: Specular glossiness set to 0
specular color set to 255,255,255
specular strengh set to 100%

If I change Specular glossiness (more than 25%) : objets don't show up as really bright anymore
If I change specular color to 0,0,0 : objets don't show up as really bright anymore
If I change specular strengh to 0% : objets don't show up as really bright anymore