A competent sharpener should dress the wheel before sharpening each pair of skates, but many don’t bother if it’s the same hollow. The grind stone can and does change shape during the cut.
I started out on 5/8”, easy to hockey stop. As my edge control improved I went down to 1/2” then 7/16”. I feel I get better edge control and less unwanted sideways sliding. I feel I can get more push hence speed on crossovers etc. However, this has not been measured, just an impression. Initially hockey stops and backwards one foot stops were harder on the deeper hollow, the blade would chatter, but I learnt to adjust the angle. I think Bill is experiencing this, he is used to one angle, but needs to adjust it. The chatter is I think when the blade digs in too much, grips the ice, then jumps as it breaks free. The angle of the blade to the vertical is critical. When I was a beginner, a deep hollow had too much grip, and was too unforgiving.
Generally the lighter you are, the deeper the hollow, plus personal preference. But I know a very slight skater who skates brilliantly, played hockey for the GB under 18 team, but has 5/8”. I suspect he gets away with it due to superb edge control.
I now sharpen before each session, as I like fresh edges.