A hammer is a required part of the tool kit im afraid! I know one member on here has come up with a way of limiting the steering lock so they dont catch, but obviously this makes 3 point turns a little more difficult. I am going to use a combination of both as I have 19's.
If you went down by a profile size next time you chaged the tyres, that would help, but would affect the look and the handling. Dropping a profile on yours would be as follows
225/40/18 - 637.2mm diameter
225/35/18 - 614.7mm diameter
So that would give you 11.25mm extra clearance which is quite a bit
If you dropped the width down but kept the profile that would help too, but less so.
215/40/18 - 629.2mm diameter (Gaining 4mm clearance)
Different make tyres can alter the clearance too, but is somewhat more hit and miss on the results. Or, you could use part worns like I do, which will gain you 3 or 4 mm AND save you money Hahaha!