200 races is not a bad sample.
If one is hitting 21% POT betting 4 horses, I would not change anything just yet.

Well done.

Be prepared for the run of outs that will come up, no matter how good the ratings.

What I do is stop after 9 outs in a row & wait for one of my selections to get up before re-commencing.
It works for me.

If one wishes to establish a clearer picture of how ones system may perform , one idea that works well is have 3 sample batches of 150 races.
If one batch shows a profit & the other 2 batches manage to break nearly square , the plan has potential.



The only thing that could kill the plan is short prices that are not in ones top 4 selections .

So its an idea to avoid any race where the second Fav in the race is not paying $4.00+

That way, one is only competeing with one thats poor value & a chance of getting up , not 2 horses of poor value with a chance of getting up.

Cheers.

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Cheers.