To close the loop on this....One of the things the tuner noted originally was that there was some sort of checksum error in the stock file, an error which he thought he had corrected in the tune. But, when my issue persisted, he decided to create the file using a different program, one that he doesn't ordinarily use. I loaded the file this morning and, VOILA!, no more kangarooing. He's still a bit mystified as to exactly what the problem was with the first file. But glad he was able to solve the problem without my having to take all sorts of live readings.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife