I’m 5’6” and had been riding 170 cranks for many many years. When I tried 165’s they felt pretty short at first but eventually they felt OK. But I wasn’t about to get 30 new cranksets for all my bikes…so I still ride mostly with 170’s. Some cranks, Like Cybrei are available in middling sizes, like 167.5. So I do have a couple of cranks that are 167.5, and those don’t feel drastically different when pedaling but they do give me a little more room without my knees hitting my chest. So…why not try 170s or 167.5? 172.5 all the way to 165 seems like a big jump.