So i need to deliver this model including textures and VRAY render really soon but what i'm seeing here has been bothering me for days, the client require seamless in almost any visible surface or half - visible surface so i don't have much freedom in unwrapping it. I've tried many iteration for the seam but this is the best outcome only. In substance painter it looks fine with normal reflection, including Blender Cycle, all fine reflection except for Vray in MAX.
UV & texture as shown in substance painter
I really need an answer fast