Header Image Size and Social Links

Hi, I like the size of my header image when the "header text" is enabled, but I don't want the header text enabled. When I disable, the header image gets cropped and some of the image I designed gets cut off. How can I increase the size of the header image with the header text still being disabled? It doesn't necessarily need to be the exact size it is when the header text is enabled, just a little taller than it is without. A secondary question — is it possible to change the location of the Social links? I'm using the Catch Adaptive free theme. Thanks! PJ