Printing from Acrobat to PDF 2UP Borderless

I have created a document in InDesign that I made 5.5x8.5 with full bleeds. Now I want to print it 2 up on an 8.5x11 page after reording the pages in Acrobat.

So in InDesign, I generate the PDF with no bleeds, exactly 5.5x8.5.

I run my script to reorder the pages like I want.

Then I print the document to PDF using the Adobe PDF printer.

I create a custom page size of 5.5x8.5 to accomodate the source PDF

Then I click MULTIPLE.

What is messed up is it asks for orientation. Do they mean orientation of my source document which is portrait or the resulting 2 up document which is landscape?

So the closest I can get shows the preview image with one page on the left, one page on the right (both pages are portrait but make up a spread that is landscape). I am careful to print at full size, but there is still a white border around each page. I never asked for a border, my source document is the perfect size to fill up half a page and I am printing 2up on the page, why is there a border?

I am so close to having this process worked out that it's wild. When I get this done, I know of so many people who will benefit from it. All I need to do now is eliminate the borders when printing 2 up in Adobe Acrobat while printing to PDF. 

Thanks for any help.