Hello,
Enter the page and set margin-top:-40px in the upper row settings: http://prntscr.com/lexqqs
Please add this code to the Theme Settings > Custom CSS > Global:
body .main-header,
body .sticky-header.header-clone,
body .header-spacing {
background-color: rgb(25, 25, 25, 0.6);
}
Set the transparency as per your needs.
In order to remove the jerk issue you need to remove the second logo for the sticky header http://prntscr.com/qxxvby
You can find the overlap option in the Header option https://prnt.sc/qxyfuw in the Theme Settings > Header > Header layout
Best Regards