Converting cmyk PDF to greyscale. Lines are being altered!!

I have a big catalog, done in InDesign as a CMYK doc...exported to a Press Quality PDF. Printing it in black only, so I need to convert the doc to greyscale. I've googled for days, tried everything. It converts the doc to greyscale, but it's screwing around with the line weights of any lines I have on the page. I have a 10 point horizontal line at the top and bottom, and the converted greyscale now has a 1 point line! Or I have an Illustrator logo with a 10 point white line around the logo, and the converted document has it down to a .5pt line! It's insane. Everything else seems to be okay. Some of the logos, which are actually already greyscale/black logos, disappear mostly, leaving just a few elements on the page. It's nuts. Last year, I did this exact same thing to the exact same files, and it worked 100% fine. Now, with new versions of ID, Acrobat, it's completely broken.
I'm at wits end. It's 508 pages, and I can not fathom how long it will take me to manually convert the thousands of photos in this thing to greyscale manually. It has to go to press.
I tried converting the master PDF using the Mac Preview app, via the Export > Quartz Filter > Greyscale. It worked correctly, except the prepress guy says all the black text is now 4-C text, so it's useless.
I've tried using Convert Colors under Tools, I tried going through Prepress tools and doing it there, and it's always the same.
Any thoughts here?

I exported as a gamma 2.0 directly out of InDesign, and the lines stayed intact. I didn't know you could export as a gs, I was told that you had to export a color pdf, then use PDF tools to convert the colors...but if you mess with the Output settings in Indesign PDF export dialog box, you can get to the gamma 1.8, 2.2, or dotgain greyscale presets, and the PDF came out perfect.

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Converting cmyk PDF to greyscale. Lines are being altered!!

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