Are your arches rolled right up and the kit trimmed right back? thats what i have done but the plastic arch is in line with the roll on the metal - could do with a touch of the trim as i've lowered mine more on the front

I run 205/40 front and 215/40 rear due to the ET & 8.5 width

Best person to speak to on here is Gav diamond as he runs big tyres etc