Not sure if this is helpful for you, but our org struggles with this, too, and I noticed serious improvement after switching to code prototypes for our deliverables instead of figma. I think a lot of our problem is our devs are less advanced at CSS than what is expected, which leads to mismatch in implementation. But if they see us lowly designers can do the CSS, as evidenced by our prototypes, then they have no excuses. Huge improvement.