I play this strategy and I think that bet selection is very stable , but to achieve profit target you must wait long time.
We can add mild proggresion 1 1 1 1 1 , 1.5 1.5 1.5 1.5 1.5 , 2 2 2 2 2 2 2 , ...
We can add mild proggresion 1 1 1 1 1 , 1.5 1.5 1.5 1.5 1.5 , 2 2 2 2 2 2 2 , ...