.0625 shift when printing, again...

I know this topic has come up before; I've walked through a dozen threads on it, but I'm still not convinced that the "acceptable margin for error on your printer" is the answer.  Quick walk-through:

1. Printing playing cards, two rows of four on 8.5x11 paper.  I have one document for the fronts, one for the back.
2. I'm not having the printer print double sided -- I print one side, feed the paper back through to print the other side.
3. I printed hundreds of sheets like this over the past three months while prototyping a game.  The front and back aligned every time with such a small margin for error that it was unnoticeable when the cards were cut out.
4. Installed InDesign on a new laptop and can't get a single front and back aligned now.  This includes files that I produced on the old machine which previously lined up perfectly.
5. It's incredibly consistent -- there's an additional .0625 inch to the right margin on the landscaped pages.  And it's .0625 every time.  Someone made the comment that if you print front/back 10 times you'll get 8 variations.  Point taken, but not happening here.  The change is extremely consistent.

It seems like I must have a setting in InDesign adding that extra bit of margin to both new and old documents at print time, but I can't find it anywhere.  Copying my print profile summary below and would certainly appreciate any guesses or insights that people have to offer.

Print Preset: 8 Card Spread
Printer: HPFD7EB5 (HP ENVY 4500 series)
PPD: N/A
PPD File: N/A

General
    Copies: 1
    Collate: N/A
    Reverse Order: Off
    Pages: All
    Sequence: All Pages
    Spreads: Off
    Print Master Pages: Off
    Print Layers: Visible & Printable Layers
    Print Non-printing Objects: Off
    Print Blank Pages: Off
    Print Visible Guides and Baseline Grids: Off

Setup
    Paper Size: Letter
    Paper Width: 8.5 in
    Paper Height: 11 in
    Page Orientation: Landscape
    Paper Offset: N/A
    Paper Gap: N/A
    Transverse: N/A
    Scaling: 100%
    Constrain Proportions: On
    Page Position: Centered
    Thumbnails: Off
    Tiling: Off

Marks and Bleed
    Crop Marks: Off
    Bleed Marks: Off
    Registration Marks: Off
    Color Bars: Off
    Page Information: Off
    Printer Mark Type: Default
    Crop Mark Weight: 0.25 pt
    Mark Offset from Page: 0 in
    Use Document Bleed Settings: Off
    Bleed Top: 0 in
    Bleed Bottom: 0 in
    Bleed Left: 0 in
    Bleed Right: 0 in
    Include Slug Area: Off

Output
    Color: Composite RGB
    Text As Black: Off
    Trapping: N/A
    Flip: N/A
    Negative: N/A
    Screening: N/A
    Simulate Overprint: Off

Graphics
    Send Data: Optimized Subsampling
    Download: N/A
    Download PPD Fonts: N/A
    PostScript®: N/A
    Data Format: N/A

Color Management
    Document Profile: sRGB IEC61966-2.1
    Color Handling: Let InDesign Determine Colors
    Printer Profile: Document RGB - sRGB IEC61966-2.1
    Preserve RGB Numbers: Off
    Proof Profile: N/A
    Simulate Paper Color: N/A

Advanced
    Print &as Bitmap: Off
    Bitmap Resolution: N/A
    OPI Image Replacement: N/A
    EPS: N/A
    PDF: N/A
    Bitmap Images: N/A
    Transparency Flattener Preset: [Medium Resolution]
    Ignore Spread Overrides: Off