Sorry to hear you are suffering with road noise.
Cant help much but check the tyre pressures are correct. Perhaps a word regarding whether you have the right tyres on with your ford dealer.
My 1.8 petrol Titanium running on 17" alloy wheels is smooth and quiet. I had a X type Jag before and the C max is smoother more comfortable and quieter.
Ford C Max 2008 1.8ltr Titanium
with 17\" alloys