All 2018+ 10R80 Trucks have the liquid-to-liquid cooler lifted from the Super Duty.With more research it look like Ford ditched the front mounted Auxiliary transmission cooler and went back to the OTW cooler located in front of the transmission...... this would kinda explain the higher temps on the 2019.
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The turbos heat the coolant and the coolant heats the transmission.
The specs for the ULV Fluid call for a preferred operating temp of 206F-215F with a overheat (250F+) duration of no more than 30 minutes continuous.
The usual way to lower coolant temp and thus trans temp is to downshift and run at higher rpm. This allows lower turbo boost (for a given power) and higher coolant circulation speeds.