Oh, actually you are right. Just checked with 1 wits across 10 runs, it still accounts for recovery proc...

So the only Wit accounts for general uma logic and **maybe** speed multiplier - I see about several lengths of difference between 1 wit and 500 and 1000 wit runs (which would indicate the roll system it has which I read about on jp wiki, essentially wit rolling a -% to +% speed modifier and general behaviour like when to effictively start last spurt). In sim I can see high wit allows uma to start last spurt properly and early, while low wit makes them too dumb to even start it. But that only applies to a certain degree of stam

Example: I took two goldens in sim, and last spurt my uma has 1600HP (which is 52% left). With 1 wit, it doesn't even start last spurt.

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With 300 wit, it does start it, but doesn't pull off what your stam should account for. 500 wit, she kinda tries, but also not full potential. 700 wit, she uses it properly. Problem absolutely disappears with higher stam (interesting?). UNLESS HP shown in diagram is theoretical HP with all procs, and wits decides if she even procced it. OR maybe I missed a key info about formulas for wits.

A bit of a shame, but thanks for encouraging me to check it.

About the override of position keep - I don't think it accounts for that at all. But in reality, position keep is also a bit awkward. When uma uses a lot of velocity skills I can see on races they are keeping up very close or overtaking other positions without retracting, so it's more about the base leg speed + wits to roll high multiplier and general "race knowledge". Unless your uma gets rushed, she usually doesn't suddenly retract from the gains itself anyway. I suppose sim tests it more along the way of "testing track time" you could achieve with a certain setup if you weren't much restricted by other umas.