Center stick planes feels more responsive, Not because ED deliberately did it but because they use mechanical linkage that directly translate stick movements to the flight surfaces. Therefore, planes with no FLCS get more responsiveness whereas planes like F-18 / Mirage 2000 / JF17 (those are the planes with advanced FLCS in real) feels different (less responsive) in DCS. Because FLCS translates pilot's input command and calculate it based on it before it finally sends signals to the flight surfaces.
F-16C has advanced FLCS and the way of it's Side stick control input works is quite different to other airplanes. Most planes with the center stick have almost directly linked to the flight surfaces. The more you deflect your stick, the more surfaces move. The F-16C's Side stick is more of a G commander. The amount of pull is translated to the willingness of how much G the pilot wants. and it is the FLight Control Systems that actually decide how much AOA that plane can get to achieve desired G that pilot wants. Let's say you are turning sea level with two tanks, making right circle with full afterburner and barely making 3G's (230 knots let's say) , If you want max AOA in that speed range, pulling 25 lb of pull (which is the maximum force range of F-16 Side stick in real) get the same result of pulling 7 lb of pull whereas planes with direct linkage don't.
So responsiveness has nothing to do with center stick or side stick. Speaking of responsiveness please try flying Falcon BMS F-16. it's way more responsive near the center where F-16 in ED is quite null.
Coming back to original topic, Yes there are built-in curvatures on the F-16 in DCS right now, and I do think it needs to be re-worked or at least, revised.
I am an FSSB R3 user for years and all of my friends who use FSSB R3 have trouble flying F-16C in Formation. Acrobatic flying in formation is virtually impossible with the current F-16 model. (Trust me, members of virtual thunderbirds are not gonna perform their shows with the current F-16 model.)
Yet I'm guessing it's the built - in curvature that ED deliberately set, it could be FLCS issues or something else. but one thing we do know for sure is, (or at least there are many people out there who are going to agree with this) something is wrong with the response of the F-16.