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Do not muck about with the fluid level on a 722.6 tranny. The fluid level should be set with the fluid at exactly 80C, and this is easily done with the SDS. The transmission is sensitive to fluid level, and you can screw things up if it's not correct.
Hard 3-2 and 1-2 shifts are typical of the early ETC units, and I think that the freewheel units ("sprag" units) are also failure prone causing abrupt shifts. Before changing the fluid level, use SDS to read any stored codes (don't always set off CEL) and find if the adaptation values are out of whack somewhere. The SDS can read all kinds of detailed info about the tranny, including shift fill times and other data. Diagnosing problems with a 722.6 is not a simple task.
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