When you're done, add the essential words from your bullets next to the visuals.

If you find it hard to support a certain point with visuals, just leave the main words from the bullets in one slide, but make it BIG.

Here's an example of a well-balanced presentation using the tips from above.

http://www.slideshare.net/Adnerds/why-nerds-will-rule-the-world-conquering-advertising-first.  Tobias Schelle