Full throttle kick down up shifts are the only time any up shift should happen at red line or just below. From your description the 3-4 up shift is a slip. The K1 and K2 are clutch drums

There are MB valve body up date springs for a delayed 3 -4 up shift. I need the all of the numbers stamp on the passenger side transmission rail, just above the pan. To see if it applies to your transmission