With a Win 30% SR one has to be prepared for the thoretical run of outs based on 10,000 bets of 20 outs in a row & 7 outs in a row for the 66% Place SR.

I find 3 samples of 150 continuious bets gives a fair indication if it has legs or not.
Each sample should either break even or show a profit.

Your 4% of bank betting 1x3, sounds reasonable enough.

Cheers.

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Cheers.