Regarding header height and hero image height changes – You can change the header and hero image hgt by adjusting padding.
For eg: you can use the below custom CSS in themeoptions to change the title area height.
#title-area {
padding: 50px 0 30px 0;
}
You can change the hero image header hgt in the widget edit window itself, basically you just need to adjust the padding.
If you have any difficulty in adjusting the same then pls share the specific page link, ll provide you the required custom CSS.