In some presentations, I use a template with a 2-line slide title, giving me more screen real estate to spell the key message of a chart. The format is very similar to exhibits I drew at McKinsey, where the message of the slide was written in a paragraph that could span 2-3 lines of text in point 12 font above the chart headline.
When to experiment with this format? Smaller audiences, lots of complicated data charts, chart messages with nuances that are hard to capture in a newspaper-style article heading.
Oh, and when you use the longer headlines, there is not reason to re-write that same sentence in a big bubble or box on the right of the chart.