Just saw this post now. I’m 173 cm and run 165mm cranks. It makes a huge difference for me. Eases my hip angle and reduced knee discomfort, as my hip impingement was forcing my knees wide. The biggest thing I noticed was going back to 175mm cranks and how weird it made my hips feel.
I definitely don’t think you’ll regret it if you switch. That said, I have very short legs, so perhaps the difference was more noticeable for me.
Try ZRace cranks from Aliexpress, if it’s a road bike. They’re super nice, and you can get a set for less than $100 in 165mm.