I would say the Tourances are a good tyre and i never really noticed any difference in the wet from one tyre to another apart from a pirelli which was crap.
I think it doesnt really matter what tyre youve got if its squared off your handling goes up the left and when in the wet its worst as you try and only slightly lean in and hit that point on the tyre where your just going over the edge of the flat spot. (im on it as the moment and have had the rear spin up so easy mid corner in the wet)
Ive a front Avon Distanzias on at the moment and handling grip etc good but rears going on thursday so time will tell, never used them before.