FSD T-38 Talon and its navigation knobs

Hi,I sometimes fly free FDS T-38 Talon and I find it really cool. However, as I want to fly in VOR to VOR scheme, the navigation equipment of this aircraft seems to be not precise enough, i.e. every single click on hdg or crs knob results in 5 degree jump and the flight precision is far from being good. When the plane is on the ground or one flies it slow (below 200 kts) those knobs allow me to turn the left or right with a gradience of only 1 degree but when it gets faster, 5 degree jump returns.Is such situation normal in training jet planes? Or maybe should I correct the nav gauge with FS Panel Studio? Of course if it is possible to correct it and such correction makes sense at all...I would be very grateful for your help and I am looking forward to establishing Talon exactly on landing path :)Kind regards