Hi Chris,
We have an option called Print Layout in plugin settings. You can try out the options and check which one best prints the label for you.
In case you to approach Stamps with the query about the format/size which best suits your printer.
Once you provide this info, we can incorporate this functionality quickly in our plugin for you.

Let us know if you have any query.
Note : If you to wooforce.com –> My accounts.