I would recommend 1.25%
This allows for 20 outs at $5.00

Here is a Maria type staking plan one may like to check out.

1.01-6.00 Bet 1%
6.01-8.00 Bet .6%
8.00-10.00 Bet .4%

This is good for approx 25 outs.

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Cheers.