Lines in composite walls

[JKL]

Is there a way to get rid of the extra material line where my composite walls join(see image)? This is mainly an issue where my exteriors meet my interiors. My material intersection settings are in the correct priority. Last project I made a fill and covered each one. That can't be the only option?!

Thanks!

[SenecaDesignLLC]

Choose one of the exterior walls and lower it's intersection priority, I would do the vertical wall.