I also notice this. I have always had a left/right imbalance (right leg stronger), which I’ve verified comparing stages data to powertap on the same rides. It’s definitely more pronounced at higher power output and when I’m tired. A few years on stages has not noticeably corrected it, but if I detect my wattage dropping mid interval despite being sure I’m not decreasing output, I usually focus on smoothing my pedal stroke and it corrects. Funny enough if I focus on favoring the left leg, my power spikes then drops, but if I just focus on pedaling smoothly it rises up and sustainably stays there. I used to really want to fix it but after years I’ve come to accept it’s just how my body is and to just take coming up a little short wattage-wise on tired intervals with a grain of salt.
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