Jellycopter - pedantically, flapback is considered under the umbrella of flapping to equality (like inflow roll) and in this case the effect of raising the lever creates an inequality of lift across the disc because of the difference in V squared such that the disc flaps back - exactly the same result as when increasing speed - hence my use of the term. Just because CFS doesn't call it flapback doesn't mean it isn't - they probably would if it was in AP3456. ETPS deals with both in the same paragraphs in their notes. Don't forget, some of us were teaching this stuff before you completed your pilots course
ISTR that the correct term for this is something like 'pitch instability due to collective application'.