Good to hear from you. Have you perhaps taken a look at Page Settings? If not, go to Pages, edit the page in question and then locate the Page Settings meta box in the right column. Try disabling the header bottom margin and see if that helps.
Thanks for hanging in there. I think we’re almost there. Please, can you check, is the Page Template set to Page Builder Home or Default? Try setting it to Default and then using Page Settings as required.