Thanks for the clarification.
I reviewed each of the custom templates saved within your account and all of them are currently using the [DESCRIPTION_AND_IMAGES], which is the default tag that is used in all of our templates to determine where and how the description and images will be displayed when the templates are used.
In order to modify any of these templates to use full size images, you will need to delete the [DESCRIPTION_AND_IMAGES] that is already present and replace it with a [DESCRIPTION] and enough individual original image tags to support the maximum number of images you may need to use.
You can add the [DESCRIPTION] to your custom template by placing your cursor in the desired location within the template editor and then clicking the “Description” link in the Custom Template Tags section to the right.
Similarly, you can add each original image tag to your template by placing your cursor in the desired location and clicking the appropriate links labeled “Image 1” through “Image 24” in the Custom Template Tags section while “Original Images” is selected from the “Choose Image Type” drop down menu.
The tags for your original images will look like [IMAGE1_ORG], [IMAGE2_ORG], [IMAGE3_ORG] and so on once they have been added to the custom template editor.