Unsure about DCS but I get a lot of the same in many IL-2 Great Battles aircraft, like when expending all airspeed in a vertical climb, the ailerons, X axis, go limp, but Y axis, the elevators/pitch, still has strength in it so I can't gauge it as well.
Was never an issue with the MSFFB2, and I've adjusted periodic, spring, dampner etc to try to isolate the issue, alas no go.
The Spitfire MKVb is the best one so far, probably the best FFB I've felt in IL-2 Great Battles on the Rhino, on the other side of the spectrum there's the Nieuport 17, Camel, DR.1, P-51 etc, elevator, Y axis, feels like the same constant pressure going top speed as it does at stall speed, with only rumble/rattle/shake as warning when I stall and no airspeed queue's at all.
War Thunder's FFB is non existent apart from arbitrarily shaking at the weirdest of times, while IL-2 CloD (once FF files are modified with Fedit) and IL-2 1946 so far has hands down the best over-all feel for all their aircraft.