Setting up warping software and using multiple screens

OK, this is the dilemma I’ve got at the moment and would be grateful for some help or advice, please. 

I’m building home flight deck based on the BAe 146.  The diagram on my blog shows the set up for my system - http://bae-146-home-build-flight-sim.blogspot.co.nz/2017/09/setting-up-warping-software-and-using.html 

I’m using two Dell S320 short-throw projectors for the scenery on a 180o circular screen. I’m using Nthusim software to manage the screen warping.  Inside the cockpit I’ve got two standard monitors that I want to use for flight instrument and engine management.

The computer I’m using is a bespoke system that I built 2 years ago with a reasonably high end graphic card, the Gigabyte GeForce GTX 980 with 3 Display Ports, one HDMI and one DVI outlet. I also have the option to network my system to a second computer which I was thinking could run the monitors in the cockpit.

The problem I have is that I don’t seem to be able to use all the display ports at the same time if I’m using the Nthusim software to warp the external scenery.  To do this you have to set the graphic card software to the surround screen setting which seems to then cut out the use of the other ports.  If you don’t use the surround screen setting the Nthusim software only displays on one of the date projector screens and you can’t then span it across the full 180o. 

I would love to hear from anyone who knows how to solve this problem and make full use of the graphic outlet ports.

Thanks for any help