Yes i was thinking too we are getting complex here. I was thinking of scaling the image in Photoshop and using that. It is obviously clear with your last answer that the them is fine (as mostly, it is the user,not the software…).
If however you still feel like showing me the steps as to how to fix it the way you suggest, I am happy to learn.
Here is the link on my testing site in case you think it worth teaching me here.