1) Can you provide some more details? We have tested all headers, and they all work 100% here.
2) You can use this custom css:
#header-section.header-6 #header {
padding: 8px 0 0;
}
nav#main-navigation .menu > li, .header-4 #main-navigation .menu > li, .header-5 #main-navigation .menu > li, .header-7 #main-navigation .menu > li {
padding: 0 10px 10px;
}
3) Parallax won’t work on mobile, as there is no functionality for it on mobile devices – on mobiles, the image scrolls with the page.
4) You are using the large button size? Use standard instead.
Hope that helps.
– Ed