20/20 with Air Force will control down force and you can add lift bags and it will control them also. You can add row flow and control clutches and hydraulic drive so you can variable rate.  It will not plug into the harness on a Kinze.  You will need a new planter harness and seed sensors.  If buying new seed sensors I would go with the wave visions for better accuracy. Cost will be over 6k but I think will be more accurate and control more.