PDFs are always scaling to fit the page when printing, after OS X 10.9 upgrade

Question

Hello,
When I try to print a PDF on a sheet that is larger or smaller then the page size I have selected in Acrobat, it always reduces or enlarged it to fit, even when I tell it not to do any scaling. Please see my step by step process below for more details on how I am sending the file to the printer.
Preface:
This problem began after I upgraded my Mac OS to 10.9, and it only applies when I print from Acrobat Pro to our poly platesetter (I work in the prepress department for an offset printer). I have Acrobat Pro 9 and 11 on my computer, and I have the  problem using either one.
• I do not have this problem when printing from InDesign, or any other CC application.
• I can print to our four other printers (desktop or copiers) from Acrobat without any scaling problems.
Description of the problem:
This is an example of a file I may need to print, a #10 envelope. The sheet and document sizes are in red.
The 'Page Size' is 4.13" x 9.5" and I have it set to print 'Actual size.' I have also tried 'Custom Scale' at 100%, but I still have the same problem. The preview in the print dialog is correct. It should just print the envelope, not the cropmarks that were on the PDF. I've sent down countless envelopes this way before I upgraded to 10.9 without any trouble. 
Above is a screenshot of the file after it has been ripped at our platesetter. You can see it reduced the entire document to fit on the selected page size. The cropmarks should not be there, and it shouldn't have reduced the artwork.
I also have the opposite problem of  my artwork being enlarged if I send something down that is smaller than my selected page size.
I know this a very specific problem, so I understand that I may not  get much help on it. Thanks in advance for any help you may offer. I have workarounds, but this is really slowing me down, and if I accidentally plate something that was reduced or enlarged can be a very costly mistake if it get printed that way.
My Equipment:
• Early 2008 -  Quad-Core Mac Pro 2.8 GHz
• I use Abobe CC applications, but I've tried Acrobat 9.0 as an alterative to Acrobat 11
• Our platesetter is: Mitsubishi SDP-Eco 1630 IIIR
  with a Harlequin RIP 9.0 Revision 0
Thank you in advance for any insight you may have.

Answer 1

A workaround I found for my Fiery RIP if insist on using Acrobat XI:
In Acrobat's Print dialog, set:
Choose paper source by PDF page size = ticked
Use custom paper size when needed = ticked
In Page Setup, set Page Size = your custom size, i.e. 4.13" x 9.5"
In Printer, open the Fiery driver properties and set Paper Size = your custom size, i.e. 4.13" x 9.5"