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I’ve just gone down to 160mm (im 179 tall) and power definitely hasn’t gone down (I do a specific workout once a week so can see). It’s maybe gone up, but hard to confirm that’s the cranks.
I wouldn’t know that I was riding different lengths, but I went for a bike fit and when we changed the length whilst I was on the bike I noticed it when tucked. The guy didn’t tell me what length we were at until afterwards.
https://bikepacking.com/gear/crank-length-test/
Make of that what you will.