1. because I canWhy do you need to back test all 27?
2. So I can see if there are pairs that seem to have better returns with my algo.
possibly leaving out some for trading or trading the better pair if one currency has multiple trades
3. So I can estimate drawdowns and returns expected.When I see a drawdown within expected levels , I can stick with the plan ie Confidence
4. After a year I can review and see if the backtesting was giving reasonable results compared to forward results.
5. So I can compare completed algos to one another .
I also intend to forward test 3 or 4 algos together once I have a few to choose from