I have experimented with this doubling after losing trades. There is no question that it can make for some exciting and profitable trading However, there is one key factor required for a reliiable result. And that is that the reason for entering the position must have a positive expectation of a gain. In other words, this method can make profitable systems better, but the reverse is true, that losing systems can lose much faster. I see no reason for an expectation of gain in your cable reverse proposal.
btw, this kind of system will help you find your risk tolerance limit after it doubles a few times.
Jim