Your height has nothing to do with crank length, it's your leg length and saddle height that are relevant. FWIW, I'm only 5'-6" tall, but my cycling inseam is 32-5/8 or 83cm and my saddle height is 73cm. I switched from 170mm to 172.5mm many years ago and really didn't notice the change. Going up from 172.5 to 175 should not be a big deal. How people set their saddle height varies a lot. If you feel over-extended at the bottom of the stroke, the saddle might need to come down 3mm, but then your knee will be even higher at the top of the stroke. Start with no change to the saddle height and go from there.