From Air Safety Week (Sept 18th 2006), and although focused on T-tail aircraft incidents, some of the findings regarding vertical velocity/ trajectory under stall may be pertinent to the current discussion.
A Tale of Two T-Tails | Air Safety Week | Find Articles at BNET
Re: MD82 crash (Preliminary) AUGUST 2006 (WCA708)
Quote (page3):
"the engines wouldn't have recovered until gulping much denser air at the lower altitudes, shortly before impact at their descent rate of over
7000ft/min."
...."According to the Flight Recorder, WCA708 descended at a
high angle-of-attack "
Quote (page 4) :
"The descent from FL330 took
210 seconds. The debris field was only 200m long and 110m wide, indicating
a near vertical descent with no forward airspeed. The crew had radioed that "both engines had flamed out" but they were merely locked back at flight idle."