It's real common for the early 722.3 trannies to have a harsh 1-2 shift. It is semi-adjustable by an experienced tech. Actually it is VERY adjustable, its just semi-possible that you can find someone who knows how to do it.
In 1983 there were a number of modifications made to that tranny including a different Band and servo piston with some valve body mods thrown in for good measure. Those parts and appropriate end play adjustments upon rebuilding can make the tranny as smooth as later ones. In the mean time a good tuning of the Vacuum controls and control pressure cable can get most by
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician