I must be doing something wrong:
1) I tried adding to the css background-size: cover; (I put this in both the partial and full image header definitions)
2) I tried the plugin but it wouldn’t let me set the images
3) I tried to upload a smaller logo image 320 px width but can only upload the default 960 by 80 when going to the header image under appearance.
BTW, what is the correct way to upload the header image?