You already have all what you need on your VI to solve your "problem"!
If you want to replace the "initial temperature" control by the measured temperature... just do it!
You need to make one measurement of the temperature on the sensor channel (use the same DAQmx READ VI that is in the loop).
Do this outside of your loop (just after the "DAQmx start task" and connect the read data to where the "initial temperature" control was.