I usually drink flat whites, single shot (~30mL) in a 150 mL cup. I read around about 1.5 years ago and found quite a range of opinions of what the ratios of shot:milk for particular drinks. Im usually disappointed with coffees when I go out for breakfast etc. If you watch the "baristas" you can usually see why (pre-ground, poor dosing, poor levelling, poor tamping, PFs left on the bench getting cold, all leading to bad extraction that is not watched at all, just cut either when the timer goes off or when they remember they were pulling a shot). A "small" flat white is often served in a "normal" cup. Most people order mugs or bigger. Its a real pleasure when you find somewhere that does make a decent cup consistently. Ive only found one place where I live - all shots are pulled with a bottomless PF. so to answer your question, I reckon youve just got to find a good place where they actually care about what they serve up. Funny thing is, a few years ago I wouldnt have cared - how sad is that?