Originally Posted by OVERTALK
Despite being in level flight or shallow climb, upon acceleration in such a situation a pilot might strongly perceive that the aircraft is pitching up and respond by pushing the nose down steeply.
Overtalk, not certain if you are qualified, but for I think all of us with IR training our instructors dinned into us from day 1 to work on instruments, not bodily awareness.
My own guy had a good basic technique. On the first IR lesson he just got me to put head down and close eyes, and comment on what I felt was the attitude of the aircraft while he had control. When I was saying "straight and level" he would say "look up" and I would find he had gently put us in a spiral dive (which I then had to get us out of). Did it a couple of times. Never forgot it.