I can’t see how you could lose that much power from properly adjusted clipless pedals. So I’m guessing it’s an adjustment issue, unless there’s a mechanical issue I.e. the pedals aren’t rotating freely. Did you adjust the saddle height when you switched? Clipless can put the ball of your foot in a very different position with respect to the pedal spindle compared to flats, so you may need to move saddle height accordingly. Other possibility is you’ve got the cleats in a really extreme position, best to start off with them in a fairly neutral position which puts the ball of your feet over the spindles.
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