They do spray it with VHT. It's hit & miss. The problem is they try to force you do drive the entire car though the water

I got lucky 1 day was able to drive it around it & cut a 1.99 with street tires. Pat on the other hand even though he tired to drive around there was water everywhere.
Being that I have only run Famoso once I can't give you time differences between the 2 tracks. I do know same day California Speedway in a.m. and Carlsbad in the p.m. our SS ran .15 & 1 mph slower at California Speedway
I think the next weekend California Speedway is open is Dec 14-15