Getting rid of blank space

I have 5 reports that have a part name as the header record which is then
grouped on in the report and then a sub-report that have the heights, widths
and quantities of the different parts for that part name. I have put every
single CanShrink property to Yes (PartName Hdr, the sub-report control,
detail section on the sub-report and the size of the sub-report is at a
minimum height) and I still have blank spaces. On the grouping page I put the
keep together as No for the Part Name. But still I get extra space.