Try framing your material in the assertion-evidence [0] style. Not only does this lead to more informative presentations, I find it helps me organize my story better.
Briefly, rather than using topic titles ("Experimental Setup", "Results"), use assertions ("Sampling occurred over 5 days", "Sunlight causes significant degradation") as titles. Then the bulk of the slide is some information, preferably graphical, that supports the assertion. Reading the titles in order should give you a strong sense of the presentation content.
I strongly recommend "The Craft of Scientific Presentations" by Michael Alley, which covers the assertion-evidence approach, and a host of other practical topics.