Hi,
I dont think you can do much except to hide the label if the value < 10 for example if you dont want to show overlapping labels. You can do this if you go to the design layout of your chart, click on the labels, then on the chart label series properties,
set visible to =Fields!DELTA.Value>=10 for example.
Another posibility is to set your vertical axis interval from Auto to 5. This will make the lower values big enough to display the label. However, it will make your chart really tall for the ones with high values like the month of Jun.
Please mark as answered or vote helpful if this post help resolved your issue. Thanks!
k r o o t z