HI fzpassociates,
1. Add the following Custom CSS to show the Headline above those sections that doesn’t have Headline.

section h3.hidden, section hr.hidden {
visibility: visible !important;
display: block !important;

2. Please upload same size images for all of your Portfolio images, hope it will solve your problem.
3. You can use custom css to reduce the spacing and you might have to reduce the padding-top/padding-bottom property of the section.