You are grossly underestimating the deflection/distortion/deforming your body endured during those bumps. You say your body went forward a bit but you think it was too late. If your body went forward as a result of the sudden stop, it was definitely a factor that reduced the deceleration force.

But, go ahead and convince yourself you did 100Gs. I only offer my opinion once per crash. Those who want to redefine the event to justify their resulting symptoms are examples of classic anxiety/OCD.

Concussion Anxiety Syndrome is hitting epidemic levels.