In my experience, recovering data is best used when the disk is left untouched. Reformatting it into a new file system already dramatically reduced the chance of a good recovery. Although some programs have a "format recovery" it still isnt 100%.
During the format process, any data would have been overwritten with different data.
The best way to recover is to move the problem drive as a secondary drive and using another as the processing drive (c
You have already done this however you should have recovered the data before changing to NTFS.