Hi Scott, I know you said later in this thread that you got a phase meter to handle this for you. But there is another option. If you want to check out StereoMonoizer, it’s a new app that analyzes “stereo” files to determine if they are actually true stereo, or mono sounds in stere files, which is exactly the problem you were dealing with.
The app also includes a batch processor, to convert the mono sounds into true (single channel) mono files.
You can check it out at https://www.soundizers.com and there is a 14 day demo available. Check it out, I think it will make your life with these files a lot easier.