Thanks to Jet Pilot for his comments. Even if Technical Support cannot respond in this forum, it is very instructive to have a real-world pilot make comparisons between the aircraft and the sim. Many of the points JP made I have noticed myself but could not be sure how they related to the real 727. My main references for the 727 are:
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"Boeing 727 Flight Master" by Moktadier
"Handling the Big Jets, 3rd Edition" by Davies (rare book)
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(for the full TWA manual)
"Jet Simming" by Bill Stack
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This is a superb simulation of a great aircraft and rewards some study.