With a 31%SR the theoretical run of outs in a row is approx 20

That's not to say that one hits one or two winners then another 20 outs in a row.

So the a general rule to use is to make the max run of outs represent 20% of ones bank .

That way , when we get hit with the horror run , it represents only 20% of our bank which leaves us with 80% to work with.

Another level stakes plan that works well is ...
Bet 1/200th of bank.

Adjusted up & down at the beginning of each day.

It smooths out the rapid up & down swings that occur when using a lesser divisor of bank.

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Cheers.