I agree with a number of comments above. Really doubt you'll even notice the minimal change (1/10") in crank length going from 172.5 to 175mm. My bikes range from 165mm to 175mm and I barely notice the difference there - and can't really say which length I prefer. But the difference between the 35mm tires on my touring bike and the 23mm tires on my other bike is very clear. Keep the 35mm tires around for when you want to take a tour on some rough roads or trails, but put some 25mm tires on the bike for when you want it to feel more sporty and lively. You'll need new tires eventually anyway so it wouldn't really cost any more to have both sizes around.

I'd also check with some bike shops to see if one might let you borrow an adjustable stem for awhile so you could experiment with different handlebar positions before buying a stem of the correct size from them. And try moving your saddle forward and backward a bit to see which position you prefer.