Color Space Issue: One Black On Screen But Two Blacks When Printed

I work at a print shop (using Windows 7 and Adobe Acrobat X) and often receive PDFs from customers that were created from PowerPoint. These PowerPoint PDFs often present a printing issue when there are black objects in the file.
On screen, there will be only one consistent shade of black but when the document is printed, it becomes evident that there are actually two different blacks in the file, one darker than the other.
I have done a lot of online research (including these forums) in an attempt to find a complete solution that will always work for these problem-files but have yet to find one.
I know that the issue stems from the fact that PowerPoint uses RGB colors and not CMYK like printers but trying to manually convert color spaces in Adobe Acrobat Pro to be uniform did not help. Whether I convert the entire document's color space to CMYK or just individual objects, I always get the two shades of black when printing. Can anyone explain why this isn't working for me?
I have used the Output Preview tool to determine that the two blacks in the documents are almost always C0-M0-Y0-K100 and C75-M68-Y67-K90. I have read that a custom Preflight fix can be created to seek out all instances of one black and convert it to the other but I did not have success when trying this method. I must be doing something wrong. After running my fix, I always get a message about how no issues are found. If someone can post a step-by-step guide on how to create a Preflight fix that will resolve this issue, I would really appreciate it.
I have uploaded three sample PDFs that I'm currently working with. Please feel free to review and troubleshoot them. My goal is to uncover a solution that I can apply to all three files to get them to print with one consistent black.
https://workspaces.acrobat.com/?w=j3nHuvLCo9XWHliKEpNX-A
Thank you all so much in advance for any insight you can offer.

So sorry about that. I have Published all three files now so they should be accessible to the public.
ColorSpace1.pdf
https://workspaces.acrobat.com/?d=W9QuI9UZSYRmGYnvoaS44w
ColorSpace2.pdf
https://workspaces.acrobat.com/?d=-AQHyT*HMSawAW-swQ9SVA
ColorSpace3.pdf
https://workspaces.acrobat.com/?d=DWuc0Dp-M8SKqnX6mTNnfw
Thank you for the reply!

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