Help with wheel & tyre selection

Need some help with wheel & tyre specialist on selection for a Renault trafic crew can 2011 model.
basically I had a vivaro crewcab, exactly the same, put 20’s on and tried to lower 100mm but had to put original springs back on because wheels stuck out slightly past arches, bad advise from a wheel shop.

So now I’m lowering my trafic 50mm and want it to look tight and not stick past arches but want tyres to tuck behind arches or even so it looks nice and parallel around the circumference of...

Help with wheel & tyre selection