Good evening,
I also have tried the new ST for XIM and I can say that it is working only on legacy settings - on.
On previous ST and new ST the advanced settings are unplayable. For example - if I ADS in the distance and slowly move the cursor horizontal, it moves like shaky waves. It is very hard to aim.
If I turn the legacy settings on - the cursor is very precise and is not waving or shaking. To be honest, I see no difference in previous and new ST. Maybe on new ST the aim is a little bit more precise, but only on legacy settings on.
This is my experience.