don't know if changing to 17s will help. try this...

www.tyresave.co.uk/tyresize.html

going from 195/50/15 to 205/40/17 is only gonna give you 20mm extra diameter, so 10mm increase in ride height! that may be enough, i don't know. i suppose you'll lose some of the sidewall flex as well, that might help a bit!