Scale clipboard should be in LBS & OZ mode. Spool weight is already built in as 7.4 oz.
In dry box mode, saving tare from clipboard assumes the clipboard is the dry box only, and it automatically adds the 7.4 oz spool weight for you.
Click this after copying the dry box only weight from the scale.
The system automatically adds the built-in 7.4 oz empty spool weight before saving.