Alright, wow. Now that I figured out what the problem was, you weren't kidding about the potential of Linear Ramp.
So the problem was with humanfemale's curve in that it starts off too low (at 8.0). If you move your mouse really slowly (and by slowly I mean pixel by pixel movement) the game simply doesn't register any movement. This feels awful unless literally all you do is flick your mouse from one side of your mousepad to the other, lol. If you try to slow it down and do precise aiming, your character on screen stops aiming completely.
From 8.0 I went up bit by bit until I hit the number that immediately picks up movement no matter how slow I moved the mouse... this number being 12.0. Darryl your curve starts at 12.5 which is probably fine as well but since I felt 12.0 picks up any small movements just fine I will go with the lower number in order to keep things more "linear" I suppose.
Darryl, your curve worked for me right off the bat in Training Mode as it starts off at 12.5 but the way it slopes down all the way up to 100 basically makes it a deceleration curve (I'm no curve expert by any means, this is just my personal thoughts). Thinking about it that way, I prefer humanfemale's "straight curve" which is +8 all the way up to 100.
So I went ahead and combined the two and ended up with this curve. It starts at 12.0 and remains +12 all the way up to 100. This way, you start at a certain speed and that speed remains consistent throughout and does not all of a sudden slow down. This curve feels super snappy and almost PC-like compared to Exponential Ramp, I am seeing what you guys were talking about this whole time.
Anyways, here is the curve I ended up with if you want to give it a shot. Cheers for experimenting around and figuring out this workaround humanfemale!

>>> XIM4 [Mouse Ballistics] START PASTE >>>
X4MB:AAAAGgA0AC4AMAAwAC4AMgAwADEANgAwADQAMAA1GCIsNkBKVF5ocnyGkJqkrrjCyMjI:X4MB
<<< XIM4 END PASTE <<<
EDIT: By the way, this is with 1.50 Y/X ratio. That is what I started with and it feels pretty good. Might experiment with this more and report back.