My guess is that you are changing the wrong template. The first time you connect to a device the template is copied to the setup for the device. Changing it in the preferences will have no effect.
Connect to the device, click on the down arrow on the Device icon and choose Configure this device. Change the template there. You might need to disconnect and reconnect before the template is taken into account.
Your first template will produce the contents of the #read_m column unless it is empty, in which case it will produce a lowercase m.
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