Hi Michaelg,
I like certain progressional plans & here is one that should break even at half of a level stakes loss if the winners fall in the right spot.
The maths work out approx the same as the progressional you mentioned, only it is at half the outlay.

Example over 20 bets
Your original 1 2 3 4 5 6 7 8 9 10 11 12 12 14 15 16 17 18 19 20 = 210
One would need a collective odds of 9.5/1 to break even on the 20th bet.
As opposed to 19/1 at level stakes.

Using the Duel step method
1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 = 110
One would need collective odds of 10/1 to break even on the 20th bet.
Similar result to your original, but approx half the O/L .
That's a huge difference on capital outlay to achieve a similar end result.

Keep in mind that it is impossible to break even on level stakes betting if the odds add up to less than the number of winners.
But it is possible to show a profit on a progressional where the odds fall short of breaking even if one can pick the winners for the end result.

All staking plans rely on the ability to hit winners whether level stakes or progressional, lets keep reminding ourselves of that.

If one is to use any progressional, it is important to have say 2 or more banks & have a cut off rule as to when to write off ones losses & start again.
It is also imprtant to know what the probable logest run of outs could be in relation to one historic SR then set staking to accomodate at least double that.

Cheers.

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Cheers.