BARANFINN:
The answer to your question as far as I know is this:
When you lower the collective, the angle of attack changes differently on the advancing and on the retreating side, thus causing the nose to drop (hence aft cyclic in the entry of an auto), if you should step on the wrong pedal (Out of trim) this brings the nose further down. I don't know if the cyclic is totally ineffective, but like in a plane, adverse yaw is not to your advantage. So to correct the proble, correct the trim, then use aft cyclic to regain a level attitude. With regards to the R-22, well I only have 11 hours in it, but I would Hazard a guess that you may be correct there.