I am new to reporting services and find it difficult to get a report for rendering on my ASPX page.
It seems that no matter what I do with the report layout in the designer, the changes are ignored and the columns remain dry along with a large empty white space column to the right of it. Here is what I mean:

Regardless of the fact that I change the width of the columns, it always looks like this:

Looking at the markup, I see that a fixed width is applied, and the white space is TD with a width of 100%.
Here is the code I use / inherited:
result = rvDashlet.ServerReport.Render("HTML4.0", "<DeviceInfo><HTMLFragment>True</HTMLFragment></DeviceInfo>", out mimeType, out encoding, out extension, out streamids, out warnings);
The failure is that earlier this report was presented as an image that worked and looked great. I had to change it to HTML in order to add hyperlinks.
Any suggestions appreciated!