AutoPAR losing partial downloads

I downloaded a 2GB file in 50 parts. The first 15 were missing chunks so they were on the HDD as nb2 files. According to QuickPAR I only needed 80 par blocks to rebuild so I expanded the download list, manually selected enough par files, then hit force download.
This is were the bad stuff occurs:
After downloading the first par file it reset the queue status for the partially downloaded files, deleted the first 6 from the drive (connection limit), then began re-downloading them from scratch. I tried pausing all 20 RAR files then it started on the par files again but then after finishing the second par file it deleted the next six nb2 files.
At this point I've lost 12x 50MB files and went from needing 80 par blocks to ~250.
I then try to remove the rar files from the list so it will only download the par files but to my dismay it deletes the ENTIRE LIST. Apparently if a file is added as a group you can't remove individual parts.
So, the things that should be addressed:
1. Have AutoPAR treat the nb2 files as part of the set.
2. Have Newzbin check existing copies of nb2 files before overwriting.
3. Let me force PAR files to the top of the queue in an group download.
4. Let me delete individual files from a group download.
This is were the bad stuff occurs:
After downloading the first par file it reset the queue status for the partially downloaded files, deleted the first 6 from the drive (connection limit), then began re-downloading them from scratch. I tried pausing all 20 RAR files then it started on the par files again but then after finishing the second par file it deleted the next six nb2 files.
At this point I've lost 12x 50MB files and went from needing 80 par blocks to ~250.
I then try to remove the rar files from the list so it will only download the par files but to my dismay it deletes the ENTIRE LIST. Apparently if a file is added as a group you can't remove individual parts.
So, the things that should be addressed:
1. Have AutoPAR treat the nb2 files as part of the set.
2. Have Newzbin check existing copies of nb2 files before overwriting.
3. Let me force PAR files to the top of the queue in an group download.
4. Let me delete individual files from a group download.