Fitted them in the same week from memory so can't tell or can't remember(!) tyres on their own making a difference either wayMy Conti 5's are what's known as the XL model. They are the stiff sidewall version. (I wouldn't get anything with a known soft sidewall from experience).
IF i was to change brand / tyre type sometime in the future, i may be interested in firming the car a little more. And thus there is the option of gaining a little; via an even stiffer walled tyre.
Not so much in cars....but i know from bikes it can make a World of difference.
**Did you put tyres and springs on at the same time Ben ? ie: Couldn't tell the difference with one change at a time ?