Yeh the Wet is the Unpredictable Factor... you don't know how much distance or buffer to give until u know the car's limits.
Changing to a Better Tyres help a lot. My Rear tyres was almost bald n was shocking in the wet, then i changed over to new ones and made a big difference. I felt more confident in the car but i haven't pushed the limit of the tyres of how much i can give it cuz i got used to being so carefull on my near Bald rear Tyres :-)