I can't get it to work. The T3 header block remains very high, which wouldn't be a problem if the logo wasn't scaled down from 371px × 64px to 139px × 24px. I'd prefer the logo in its actual size so that the slogan can be read without a magnifying glass.
Here are my related - but ignored - custom.css overwrites:
.logo-image img {
height: 64px!important;
padding-top: 4px!important;
padding-bottom: 4px!important;
}
.navbar-nav>li>a, .navbar-nav>li>span {
padding-top: 4px!important;
padding-bottom: 4px!important;
}