I mean the posts titles, the ones in the content “blocks”.
Your block headings are to blame for creating the illusion of bad spacing. My eye is trained to see that in fact the spacing is good despite the block titles’ background color.
Anyways, I reviewed your theme as if you would have uploaded it today, I didn’t know it’s still a work in progress, I usually review themes that have been rejected around here, well from time to time.
As for all previous reviews, I recommend checking my demos, my favorite themes, it’s indeed my style of design language, I hope you like it, but it’s a great way to get to learn new and perhaps better design.
Best of luck.