Visio to PDF - High Res

I just got a new PC laptop running Windows 10 and I have Visio Pro 2016 (64 bit) and Adobe Acrobat X Pro (v10.1.16). I create UI concepts in Visio, often from other UI elements (Visio elements, external .png, jpg, etc) and it all looks great in Visio. No pixelation when zoom in on the UI Concept (view small icons, text in picture, etc.). The problem I have is when I PDF this page, the resultant PDF dos not look good when zoomed in (I do have a 4K monitor). I've tried various methods in Visio

1. Save as...PDF

2. Print - Adobe PDF or Microsoft PDF

3. Export

I've gone into Acrobat, Edit - Preference- Convert to PDF, Microsoft Visio and created my own settings:

General:

Compatibility - Acobat 8

Resultion - 4000 dpi

Images

Color Downsampling Off

Color Compression  Off

2400 dpi

Are there any other "settings" or methods someone can recommend to maintain the original resolution of my Visio file when exporting to PDF. Thanks...

Mike