18 inches on 30mm deeper convertible: Yes or rather use 17 inches?

Hello together, Actually I was already sure that I would like to screw 17 Zollr on my convertible again. I am no longer so sure anymore…. Whether not 18 inches look better. I have already used the search and found this thread which is already quite old. Therefore I want to open a new one. Does anyone have experiences with 18 Zollr on the convertible? The previous owner had the convertible lower by 30mm. Should you rather put the 17s on it or change it Do the 18 customs officers not change the driving behaviour negatively? Thank you for your answers!