If your 2-3 and 3-4 shifts are OK one should be carefull of too much modulator reduction. Harsh shifts are better than sloppy ones (from the transmissions view point).

I would make as much as one turn counterclockwise on the modulator key. I also would first be sure that you are not shifting too late into second. The adjustment is to the control pressure cable and has a thumb wheel that can be reached without removing the aircleaner. You should try and make the shift earlier which will require lengthening the cable. The 190 has a screwy adjustment that is hard to see what you are doing but is easy once you get it. Since it is easier and might offer the best solution I would go there first.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician