Ok, I solved solved this issue.

The PS4 controller works 100% without DS4 or scarletcrush or any additional software with windows 10.

Simply plug the PS4 controller into the computer and it should auto install the drivers.

As for bluetooth. I cannot get it to work.

What I do instead, is I turn off the controller, unplug the bluetooth dongle, then I connect the controller to the PC through a micro USB cable.

This is the only way I have gotten the controller to work, without lag, and with all buttons functioning while playing FFXI.

So quick recap;

-Turn off PS4 controller
-Unplug bluetooth dongle.
-Connect PS4 controller with Micro USB cable.

This should activate the controller!