I'm not sure there will be a huge difference between the 35 and 40 profiles with the car in comfort mode - but unless budget is a problem I'd be inclined to hang on to the Pretorias.
They're a sought after OEM wheel and unlike a number of Mk7 wheels actually look decent, even in black.
It would be worth looking at some branded 18s (BBS, OZ etc) at least to complement the car - eg. one of the UK guys who contributed to the wheel thread is running black OZ Legerra HLTs on his R wagon which won't actually change the look to much and will work well.
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