This....... the 2 posts after yours.
and tell Bwana the more grip in rain is caused by a bug in dedicated server
a bug I told Tim about 3 years ago.
When this happens the track has no rain but spray and track becomes faster and faster
Like Italy F3 1:47 no tow lol ( any track any car )
You may have noticed if you change rain periods offline then go to server you see the sessions you changed have dry weather but still with a rain percentage that you can adjust when it should be greyed out.
If you simply reset the % to 0 then save then go back into weather you will see it has changed back again, no matter how many times you save
Only way to fix it is to change the weather from say cloudy to clear and back to cloudy
Then you then see the % is greyed out and can't be changed again.
The other thing have a affect on "wet grip" is the amount of rubber you had to start plus the real road % wear you use.
Most rooms I set my own good rubber then reduce real road to x 0.2
I pretty sure that is when grip level is at max in bug
Of course the other bug is that spray is tied to the Real Road %
Anyway I have now reset all 5 segments in every track in server menu
Set a private dedicated server make a few rain sessions, start with good to optimum rubber then select only 0.1x road wear and see what happens when it rains