Thanks,
back to SHY's comment, his car looked really high on the track, yes, and mine was a lot lower, but as you mentioned, before the rain came, the grip was good, and I did experience a lot of traction roll, especially in the high speed sweeper...
Looks like I have found a good wet/slippery-setup then
Just need to work on the high-grip one.
BTW, this forum is really helpful