I finally got mine to shift right today. What you need to do is get under the car, and look for a little rubber cap on the drivers side of the transmission (it's not easy to see, it's really up high). Pull it off, then pull out the silver T handle and turn it a couple of times clockwise. Origianlly I had turned mine only about 1/2 a turn, but today I gave it a couple of turns and it really make the shift firm up. Still haven't hooked up a gauge to check the vacuum, but that's one thing I have to add to my list of things to do. I also turned the bowden cable one more time, and that helped to increase the time between the shifts.

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head