you probably just need to expand the summary so that it is wider to display the rest of the data. a cross-tab cell does not grow automatically and there is no way to change the width of the summaries individually...they are all the same width.
a stored procedure is probalby not going to lead to a faster overall report processing time if it is bringing in the exact data. you are pulling raw data into the report and then the raw data in the cross-tab so the stored procedure will also have to roll up raw data and then the report still has to create a cross-tab. best to check your Database > Show SQL Query to ensure that all of the WHERE clause is generated properly. if it is not, i.e. you're missing something from your record selection filter in the where clause, then post a new discussion on how to optimize the report.