SD+ reporting issues

When doing monthly reporting I've run into several issues:

1. Total number of calls differs from one report to another. E.g., All request reports shows 650 for time frame specified. Time spent reports shows 470 requests for the same period.

2. Customized reports do not seem to reflect the amount of tickets created between certain dates. E.g., when changing dates in the filter number of calls received stays the same for 20 Dec - 31 Jan and for 10 Jan - 31 Jan.

3. Completion time by category by technician report is based on the elapsed time of the request. Can there be an option of using actual time spent instead?

4. It is not an issue by it will be very useful to have a Time Spent option in the list of Advanced filter columns of customize report.

Please let me am I doing something wrong or may be there are some fixes for the above.

Thanks,
Marina