My best guess is that as you are trying to bring your cadence down to where you like it that power is dropping off. Then you are probably increasing cadence to get power back up. So it would seem logical that it wants higher cadence to hit targets. There will be a lag with any trainer in ERG as it adjusts to changes in cadence so my advice is forget about the power and just focus on riding at the cadence you prefer and ERG will sort out the rest. It will vary up and down as you go but try not to think about it too much and just be smooth.
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