Recover Corrupt Data - .CR2 RAW files

I am a photographer & have corrupted photos (.CR2 RAW files) that I am unable to open. Looking for an engineer to fully recover them. Below is the run down of what happened. 1. Took photos on an SD Card & then formatted the card & had overwritten those files by accident of course. 2. I was able to recover the lost files I had over-written by downloading different programs to try to dig out the deleted files. However, when I opened the recovered files, most of them were corrupted. A few I was able to recover, though. I was able to successfully recover 100/900 files. So there are about 800 RAW .CR2 files to recover The files I download in attempt to recover the files were: - Jpeg Digger - DiskTuna Recovery Lab - JpegRepair 3. So after researching, I believe there is something missing from the metadata, but have no idea how to figure out what's missing from it. I also read that it was possible to extract the JPEG data from the .CR2 RAW files, but have no idea how to go about it. I can attached examples of a corrupted file, & an example of a successfully recovered file formatted card. However the file size exceeds to allowed amount. The files were recovered from Disk Tuna as mentioned above.