I'd like to ask some triple 7 drivers about the cockpit airflow acoustic sound difference between 140 and 105 knots.
Sure. Most of the "airflow" noise in the cockpit comes from the air conditioning outlets. You only start to hear airspeed-related noise above c. 200kts and that's without a headset.
The main clues that things were not right would be the body angle, stick shaker and the control yoke being well back. With the FBW in normal mode, it takes a determined effort to stall a 777 as the nose-down force on the yoke is considerable: you can't trim slower than the bottom of the normal airspeed range, i.e. the top of the yellow band.
The NTSB are reporting that the P3 couldn't see the runway from the jump seat, which is something I've never experienced from that position. Certainly points towards a very high body angle.