I’m sure you’ve looked at this already but the seals on the pedal spindles are more robust than other pedals due to the electronics inside. They have more drag due to this. Both my pedals are slower to return to a down position when I unclip. I would not make any adjustments to the torque settings, battery cap, or screws that hold down the electronics. Any lost watts, if any, are absolutely not worth jacking with a $1,000 power meter for.
I remember a thread about “sticky pedal spindles” I think on Weight weenies, roadbike review or maybe the garmin forums and the answer from Garmin is what I posted above. They are designed that way to not let water in.
I do think that one pedal vs the other can end up with a slightly looser seal so that is probably why that one turns a little easier. I wouldn’t worry about it at aqll.