Meshtastic TDeck Modem Setup

I just got my first tdeck setup, I flashed it with 2.6.11. after that I set the region to US and assigned the short and long name. In modem preset, I am using long fast and the default frequency slot after the flash is set as: 1 (902.125mhz). I read in the docs that the default for US was frequency slot 20. I changed it and drove to work and didn't find anything. There likely aren't many nodes here but the question is, should I use frequency slot 1 or frequency slot 20? Here is the documentation I am referencing: https://meshtastic.org/docs/configuration/tips/