Dear davidrogut,
Here are the possible solutions for your query:-
1.For logo issue in mobile, please add this given css in additional css of customize.
@media only screen and (max-width: 767px){
.custom-logo{
width:200px;
}
}2. Please increase header image height for given path (Appearance > Customize > Header Options > Header Image ) .Steps:-
– Select “Background Image” from header image display options after that scroll down then there will a inner height options, please increase it
– Please follow the attached images for references.
Step 1: http://tinyurl.com/y5vhmtcl
Step 2: http://tinyurl.com/yyt7n9s8