Header fixes needed

Sorry if this is covered in other posts, couldn’t find the exact solution. I have a few issues that I’m hoping to find some fixes for with the Pinboard theme.

1. I want to be able to use the “Hi DPI” setting for the header image but when I do it shrinks my logo down a ton in the header area and I would like it to take up more space. I can make the logo quite large so it still works for hi DPI and fills that header space.

2. I think because there are widget areas in the header at a tablet size the search box drops really low below the logo creating a lot of empty space. Anyway I can just remove the unused widget areas completely and tighten up the logo and search box for mobile views?

3. I would like to put a background type graphic behind the logo “header image” but not sure how I can do that.

Any help on this front is very appreciated!