because the KMV has no detent ball/pin to keep it centered, and the knob that loosens the frame to rise/fall also controls axis tilt, if there is no tilt required for the photograph, I used to simply run my fingers along the front standard to keep it parallel with it.

If tilt WAS required, I adjust for rise/fall FIRST, then apply tilt 2nd. If some extra tiny amount of rise/fall is needed AFTER tilting for scheimpflug, I'd just use the rise/fall screw for final compositional adjustment.