temps like that can have a huge effect on shocks..its making the settings on the rears act much stiffer.
plus the motor is making more steam with cooler denser air.
im with greg move the bars to hit the tires harder .
sans making physical adjustments..
short term/or in a pinch..you could try to run the car up and down the retrun road or over some bumps and put/get some temperature in the shocks before you stage..see if that does anything.