I'm a bit shorter than you,with more in the torso than the legs. But, I like my 180's. I definitely wouldn't go any longer though. Plus, few cranks are readily available longer than 180.

You run into two factors.

Longer --> more leverage.
Longer --> longer circle of movement, and thus slower overall cadence.

It probably doesn't make much difference in actual power either way, and I ride bikes with both 175's and 180's with hardly noting the difference.

IRD makes longer cranks. I thought they were available in several lengths, but it appears as if only in 200mm. Those would still be really long!!!

https://store.interlocracing.com/irdexlocrar.html