Virtualbox For Mac Retina

Host:

Soon enough, you’ll be right inside of macOS, where you’ll be able to start using your mac virtual machine on Windows. Having a virtualbox mac OS is the easiest method of using mac as and when you need it. In addition, using virtualbox is far less complicated than the dual boot hackintosh method we have looked at previously. I am installing Windows 7 in a 15-inch MacBook Pro Yosemite with Retina display, using a Virtual Box 4.3.28, Would be possible to see the virtual machine in full screen mode??? Virtualbox osx-yosemite.

MacBook Pro 13, 2012 w/ 2560x1600 display
OSX 10.13.1 (High Sierra)
VB 5.2.2 w/ extensions installed, trying w/ and w/o GA installed
Guest:
WIndows 10
Issue:

Virtualbox For Mac Retina Free

I'm trying to get full screen resolution and size in Windows 10 guest on my Mac. The native screen resolution is 2560x1600. I have played around with a lot of settings and some custom video modes, and eventually got to the point where Windows is showing 2560x1600, performance is good, and things seem stable - however, it's only taking up about 75% of my screen in fullscreen mode. That's what I'm trying to resolve at this point.
Current settings:

Virtualbox Mac Retina

GA NOT installed (otherwise display is really glitchy when I force it to full resolution - however, it shows stable at 1440x900.)
256MB VRAM

Virtualbox For Mac Retina Software


HiDPI/2D/3D all enabled

Virtualbox For Mac Retina App

Used command 'VBoxManage setextradata 'VM-Name' CustomVideoMode1 2560x1600x32' which forced 2560x1600 available in Windows.
RetinaI'm attaching two log files. The 1440 version is the one that seems to be stable at 1440x900 but I can't get it to go higher. The 2560 version is the one I'm currently at, with the 2560x1600 resolution working but only taking up 75% of the screen. Any help? Thanks!