Hi Wendy,
I'm not sure about the line height, but one other option is to truncate the description field on the report to however many characters works with your column width. So, the following would give you only the first 90 characters of the field:
valueexpression=LEFT({description},90)
If you wanted to get really fancy, you could put an ellipsis or something after it to indicate there's more text they aren't seeing on the ones that are truncated:
valueexpression=IF(LEN({description})>90, CONCAT(LEFT({description},90),"..."),LEFT({description},90))
Kathy