Look around line 685 in your css file and adjust the width to the size of your logo (start at 280px)…..like this –
.header-image #title,
.header-image #title a,
.header-image #title-area {
display: block;
float: left;
min-height: 120px;
overflow: hidden;
text-indent: -9999px;
width: 280px;
}
The title area and header right widget area have to both fit within the 1152px space…..so if you have percentages that go beyond 100% then the header right widget area will fall under. So just make sure that both areas are equal to or less than 1152px.