Once the chart report is generated it is completely illegible in any attachment file
Ad Hoc View:

PDF Attachment view (it’s the same with any other file format):

I tried to play with Chart format but it does not change much, If I’ll change Interval between X which is the one I should change it just makes some of the name from the list disappear instead of extending the gap of space between them.

To narrow the amount of people included in the report seems like the only option, any other ideas?