Same height and inseam here. I rode 180s for 30 years and recently have been switching to 175, and feel I do better on long rides. The longer cranks feel torquey at first, but make me feel like I am never in the correct gear, so I poop out quickly.
So currently I have a rando with 175, MTB WITH 180, Speed Machine, Bacchetta and Screamer with 175 (never tried anything else on a bent), a SS built with spare parts with 180, and a folder with 170. The 170s feel like duds, as does the whole bike of course.
My current bents are at their adjustment limits, so even trying a shorter crank isn't very easy to do. My biggest complaint, however, is that the seats are all too short for my back.