in my experience, using input curves in dcs is problematic.
it seems to cause small but perceptible input delays, and setting a curve on 1axis, does for some reason influence other axis. i.e. setting a positive curve on the rudder axis seems to affect the elevator axis as well. its not like the same axis is applied to the elevator then, but somehow feels like you have to put in more stick movement to get the same results like when you have no curves applied at all.(pretty obvious on some modules like the 109).
i know that sounds strange, and i guess many will tell me that i am wrong on this, but throughout the years i get the same outcome with all the dcs modules i own, so i avoid using curves and rather try to get used to the behaviour of each aircraft with 0/0/0 settings.
thats not an F-14 problem though(i think the F-14 flies pretty pleasent without any curves), but a dcs core problem.