"I have heard that the stall speed in the "documentaion" was set at 120 knts, the aircraft was at 122 knts, and shortly after the accident the stall speed was increased to 150 knts. The report says that aircraft was being operated below the recommended speed of 150 knts."
DV,
Documented stall speeds don't change without extensive re-testing incurred by airframe changes. The report states a 'minimum speed for the manoeuvre' incorporating margin above the (predicted turning) stall speed - that didn't change.
No story here.