both those powerheads are designed NOT to be used in start/stop fashion.
Th issue may lies in the fact that koralias are not designed to be on a stop/start timer. They are meant to be on a soft start or gradual decrease/increase timer. The shaking is caused buy the magnet holding the porp in shaking in and out of place during startup
Maxijets will work on your wavemaker. Avoid most prop driven devices on stop/start wavemakers.
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