Run flat tyres can produce more road noise than conventional tyres due to the stiffer sidewall that allows them to function even with a puncture, so switching to non-run flats can help this. If you use a website such as blackcircles.com you can view a range of tyres and see their noise rating, so you can look for a tyre that has better noise performance. We would also suggest making some provision in case of a puncture, such as a spare wheel or emergency tyre inflation kit.