do a search on "tranmission questions". read the one that has that for a post subject. there are two basic adjustments that control shift points and shift quality. you may find your answer there.
there are other adjustments that can be made to the valve body which i think are beyond the "DIY" category. they may have re-calibrated the pressure to spec...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"