Hi tyler84,
I use the following curve for all my PS4 Battlefield 4 vehicles. I use the latest release candidate version (20150716)
>>> XIM4 [Mouse Ballistics] START PASTE >>>
X4MB:AAAAGgA0AC4AMAAwAC4AMgAwADEANQAwADYAMAA2AAwgN1R1ncjIyMjIyMjIyMjIyMjI:X4MB
<<< XIM4 END PASTE <<<
I also have the following values set:
Boost: 3850
Turn Assist: Mouse Forward