How to get dual monitors working with Nvidia in Ubuntu 14.10

I just got a new Dell XPS15 whic has an Nvidia GeForce GT 750m card in it. After trying every variation of driver setup between Ubuntu 14.04 and Ubuntu 14.10, I finally have a "usable" system, but I'm not very happy with it... Everything is just slow compared to my old precision running 14.04 with an Nvidia card. (e.g. the mouse is jerky, switching workspaces is slow, etc)

However, the real problem and probably at the root of the other problems is the fact that my system doesn't seem to like my external monitor.

It works, but when I go into nvidia-settings, it doesn't show 2 monitors like I expected but instead only one as shown in this nvidia-settings image:

Also, when I go into the displays portion of system settings, it totally gets the primary and secondary displays mixed up, sort of.... it shows that the built-in is selected as the primary display, but it puts the top Gnome bar on the external display, and if I want to use workspaces, I have to allow workspaces on non-primary displays. see this image grabbed from my secondary display:

I've tried everything and I'm not sure how it's possible to get this configured.

output of inxi -Gxx

:~$ inxi -Gxx
Graphics:  Card-1: Intel 4th Gen Core Processor Integrated Graphics Controller bus-ID: 00:02.0 chip-ID: 8086:0416
       Card-2: NVIDIA GK107M [GeForce GT 750M] bus-ID: 02:00.0 chip-ID: 10de:0fe4
       Display Server: X.Org 1.16.0 drivers: nvidia,intel Resolution: [email protected], [email protected]
       GLX Renderer: GeForce GT 750M/PCIe/SSE2 GLX Version: 4.4.0 NVIDIA 331.113 Direct Rendering: Yes

xorg.conf

Section "ServerLayout"
  Identifier "layout"
  Screen 0 "nvidia"
  Inactive "intel"
EndSection

Section "Device"
  Identifier "intel"
  Driver "intel"
  BusID "PCI:0@0:2:0"
  Option "AccelMethod" "SNA"
EndSection

Section "Screen"
  Identifier "intel"
  Device "intel"
EndSection

Section "Device"
  Identifier "nvidia"
  Driver "nvidia"
  BusID "PCI:2@0:0:0"
  Option "ConstrainCursor" "off"
EndSection

Section "Screen"
  Identifier "nvidia"
  Device "nvidia"
  Option "AllowEmptyInitialConfiguration" "on"
  Option "IgnoreDisplayDevices" "CRT"
EndSection