Dutching with Margin Maker

[EasyRead]

If I use the Dutching tool in conjunction with the Margin Maker and use say:
- Back with a stake of £100
- Margin set to 5%

I take it that if you select a horse using the Margin Maker and the Predicted Profit is more than £5 (>5%) then over the long run you will make money?

Or do you think that the Predictor tool is too much of an approximation?

I have noticed that the horses towards the favourite end are more likely to give a Predicted Profit greater than £5 with far less to travel to hit the Back price i.e. probably more likely to hit the Back price with the normal volatility of a race

As a theory to a new strategy, would backing a favourite like this when it has a Predicted Profit greater than the Margin be a good place to start?