Honestly, someone has to go out early and start building the groove up as well as cleaning off the track.

I've been doing this on Fridays at local RC track. Yes, it is oval racing. but someone has to get the groove started. I changed to a high rubber content tire because of this. BTW the floor temps do effect overall grip level. Running 4.2 seconds laps normally, with a cold floor you are lucky to get 1-2 4.4 laps then string 4.5 second laps for 3 minutes.

Off topic, yet racing related.