It's definitely not too big. I bring in sets much larger than this all the time. I've never used the FTStool, but sometimes when I'm importing data from Excel I have the problem of cells not really being empty, so it's trying to bring in a much larger portion of the worksheet.
Solution. I select all the "empty" columns past my data (use ctrl+shift), delete. Do the same thing for rows.
Save file, try to re-import
