AMD proprietary drivers can only use 2 monitors (ubuntu 13.04)

AMD proprietary drivers can only use 2 monitors (ubuntu 13.04)

I have 4 monitors I'm trying to set up in Unity with 2 GPU's (2x AMD
HD7970's). Originally I had 2 monitors on each card and tried to set it up
that way, but I kept getting the White Screen of Death and could not
resolve the problem.
I then decided to put all 4 monitors on a single card (1 HDMI, 2 DVI, 1
Mini Display Port) and Crossfire with the second card.
Upon a fresh install, the open source drivers worked and all four monitors
worked correctly. The problem is that the open source drivers caused Unity
to run excruciatingly slow, making it very difficult to work with. When I
say slow, I mean the cursor was slow, windows would take several seconds
to slowly fade in, responsiveness was slow, etc....
I decided to check out the proprietary drivers, because I had read that
the open source drivers don't really handle 3D Acceleration correctly. I
installed the AMD 13.04 drivers from the website, and got 2 monitors to
appear, but I cannot get the other two to activate.
Just to be clear, all four monitors are recognized by the drivers, but
when I try to activate them in catalyst (using sudo amdcccle) the changes
are ignored and only 2 monitors are used. When I try xinerama all 4
screens will 'turn on' and be recognized, but Unity turns black and no
windows appear (the only thing I can see is the cursor).
When I try to use RandR it complains about requested size and then a
maximum/minimum virtual size (something similar to the following:
The selected configuration for displays could not be applied required
virtual size does not >fit available size: requested=(2646, 1024),
minimum=(320, 200), maximum=(1366,1366).
As a result I've tried going into xorg.conf and adjusting the virtual size
as recommended here: Multi screen problems "virtual size does not fit
available size". I've also tried the amdcccle solution provided in that
article.
If I try to activate the other 2 windows and arrange them in RandR it says
it's unable to make the requested change (I believe a error with CTRC
148).
At this point I'm not sure what to try to make all my monitors work with
Ubuntu while allowing 3D Acceleration for reasonable performance. How can
I fix this, Is it possible? Is this issue with all GNOME desktops, or just
Unity? I've been debating switching to Kubuntu just because this problem
is kind of debilitating and I hear KDE runs better with multiple monitors,
but I'd really prefer to stay in Unity if possible.
Note: I will try to post my xorg.conf once I log into Ubuntu, I'm writing
this from my Windows bootup