Smartin,
Have you checked the vacuum modulator adjustment? Follow the black vac line from the white valve (pictured earlier in the thread) to where it ends on the trans (driver's side, just above oil pan flange). Modulator valve has a black rubber cap on it. Pop off the cap and there is a small metal "tee" handle. Pull the little tee handle out about 1/8" so you can rotate it to adjust the pressure in the trans. That thread posted earlier will tell you which way to turn it. I think you want to go CCW to reduce trans pressure. Just try about 1/4 turn or so to see if it makes a difference. Don't go too far or you'll cause the trans to slip and wear out the friction plates (don't ask how I know that!). Anyway, try searching for "vacuum modulator" which should take you to some good threads.

Alternatively, find a good independent Benz shop and have them check the trans fluid pressure with a gauge and adjust the modulator accordingly. What you have is referred to as "stacked shifts" elsewhere in these threads, I believe.

Fmb