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Oscillation generally comes in 3 forms. Normal oscillation is a rhythmic motion that is generally visible and audible. It is usually caused by PIDs being too high. Jerkiness is random, and is not actually an oscillation and it . It is usually caused by too much vibration. Replace or straighten bent shafts, balance and track your props, and if that is not enough, increase GCS -> Configuration -> Stabilization -> Expert -> Gyro Noise Filtering. Invisible oscillation is exactly that generally cannot be seen or heard. The way you know you have it is that all throttle stick positions act as if they were closer to the middle. Powerful copters (hover at those that require less than 50% power to hover) copters will take off with very little less throttle than expected. Weak copters (hover at those that require more than 50% power ) copters to hover) will need more power than expected to take off, or will not take off even at full power. Note that there have been reports of this also causing motors to run hot.
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