Scale grub resolution on a HiDef screen (Fedora 23)?

[CS DBA]

Hi All;

I just received a new laptop, the Lenovo X1 Carbon with the 2560x1440 
IPS screen.
I installed the Fedora 23 KDE spin, changed the screen resolution in :
System Settings --> Display and Monitor

Then I was able to change the login screen resolution by adding an 
/etc/X11/xorg.conf file with this content:
Section "Screen"
         Identifier "Default Screen"
         SubSection "Display"
                 Modes "1280x720"
         EndSubSection
EndSection


The login screen and the screen once I'm logged in now look wonderful 
(and readable)

The last bit is the grub menu / grub boot screen.  The text is 
practically microscopic.
If I ever need to boot into single user mode and need to actually read 
the text it's
going to be a problem.

I found this solution :
https://ask.fedoraproject.org/en/question/23526/how-can-i-change-boot-menu-screen-resolution-in-grub2/

But it does not seem to work,  I changed my /etc/default/grub file to 
look like this:
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora_f23host/root 
rd.lvm.lv=fedora_f23host/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_GFXMODE='1368x768x32; 1368x768x24; 1280x720x32; 1280x720x24; 
800x600x32; 800x600x24; auto'
GRUB_GFXPAYLOAD=keep

with no luck...

Can someone point me to instructions how to change my grub screen 
resolution? and ensure that resolution stays in place if I ever need to 
go into single user mode?

Thanks in advance