Generation IV Internal Engine - Thermostat

Looking for a 170/180 thermo for my 2010 5.3 Colorado. I got a 180*
from Summit. it's a balanced one and it sucks. truck still runs the same at 193*
stock one is 187* what is the right thermo to use ?

If your truck has electric cooling fans, the PCM needs to be recalibrated for lower fan on/off temps.

What are you hoping to accomplish w/ the 7deg decrease in coolant temps?