Recently switched to 165 cranks, from 175. I know the saddle needs to be adjusted for that. I assumed it would be both 10mm higher and aft, to stay in the same relative position. But, I just saw a video where a fitter says the shorter cranks allow you to get further forward for more power. (It sounded like he meant the saddle position, not a longer reach.) So, how does the fore/aft change with shorter cranks? (Or, is this just another one of those highly individual things?)