I had savas on the back and they were SCARY. Maybe they had been sitting around for ages but they were as hard as rocks.
I know have michelin premacy on the rear (still 205s) and I probably have more traction in the wet than I did in the dry with the savas...
These 205s hold on pretty well, unsure if wider would help a lot - but you have to give it quite a bit before the back steps out. I don't do it much now because tyres are expensive. On the savas - who cares if you chew them up (I couldn't though) they are virtually like plastic.