Ran my RhS headed 410 Friday....
It's got 10.70-10.80 in it hooking up. It ran 120ish and as fast as 121, not bad.
Not bad for the first night out.
More air in the tires, like almost 20#. I know Sloans car runs his ET Radials up there for pressures. His car goes low 1.40ish 60's. Sounds like track prep was pretty bad. If you have adjustable shocks on the rear, stiffen them up.
Sometimes the DA is on your timeslip. Summertime in Field is usually not very good for DA.