Shrinking a sticky menu

Hi All,

I am using the Ashe Pro theme to create a website.
What I am trying to do is is to keep my top bar, site logo in the image box below that and my navigation menu which is just below that at the top of my page while scrolling.
I have been able to achieve this using the “my sticky header” plug in however I need to get this to shrink during scrolling?
Is there any way to make this possible.
Currently it is taking up too much of the page while scrolling and also when i get half way down one of the drop down menus from my navigation bar it doesn’t allow you to scroll any further cutting off half of my menu.

Any advice on how to do this that doesn’t require coding would be greatly appreciated.

Many thanks,
Louise