Depending on the setup, you should be able to pull 2.0 short times on street tires...I will say bias plies are generally more forgiving, and will work well even if the track prep or suspension tuning isn't spot on, while radials are a little more sensitive.


Is it possible that the passenger side of the car was sitting in the sun all day? or perhaps your Suregrip is toast? Are you sure both tires are spinning?

I would play around with launching and shift points until you dial it in.


Regarding weather, in lieu of a weather station, I like to keep an eye on DA. it will at least give you an idea if you picked up MPH due to a change, or due to improved weather.
https://airdensityonline.com/tracks/


Put some new plugs in, makes a pass, and pull it to check for fueling and timing.