New dual extruder module vs brim setting question

I have recently install my dual extrusion module , after a bit of struggling with the setting, I have them dialed
now i am trying to prepare a larger print , i know its going to peel as all large parts do
the part has a section with support and luban will only brim the area of the support , not the rest of the part and i can seem to make it work . my small test part , it worked