In order to decrease the RadGrid height if the number of data rows is less than 10, please do not set any Height to the control and set ScrollHeight="" (empty string) in the ClientSettings.
Generally, you should not use an overflow CSS style for the RadGrid - if you want scrolling, then enable the functionality via the corresponding property AllowScroll.
Normally, browsers do not split long words to parts to make them wrap. You can force such a behavior with the following CSS properties, but only some browsers support it, so it's not a reliable approach:
word-wrap: break-word ;
word-break: break-all ;
All the best,
the Telerik team
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