Ask HN: Resume Writing Tips?

Hi. I am redoing my Resume. I feel that while it has a lot of technical details, and I'm doing my best to explain everything I worked on so it's simple enough to be picked up by recruiters and hiring managers, I still think I lack the crispness I should provide. I know that I'm better off tailoring my resume to the profiles I apply for, but I'm honestly struggling with what companies actually watch for, and how to get past the initial screening. I have a substantial background, and yet it doesn't seem that my resume is successful at conveying it.

Any advice / schema suggestions?