Using the data from https://www.mataf.net/en/forex/tools/correlation , i gathered some combinations of NEGATIVE CORRELATED PAIRS you can use with Corti by trading in one direction only , only BUY or Sell .

The more pairs has a group, the more controlled is the DD from the data I have gathered.

• You can trade 2 Negative Correlated pairs like : 
  1. EURUSD,USDCAD ( Only Buy or Sell )
  2. EURJPY,USDCAD ( Only Buy or Sell )
  3. AUDUSD,USDCAD ( Only Buy or Sell )
  4. AUDNZD,USDCAD ( Only Buy or Sell )
  5. AUDJPY,USDCAD ( Only Buy or Sell )
  6. CADJPY,USDCAD ( Only Buy or Sell )
  7. NZDCAD,AUDNZD ( Only Buy or Sell )
  8. NZDCHF,EURNZD ( Only Buy or Sell )

• You can trade 4 Negative Correlated pairs combined uniquely like
  1. EURUSD,USDCAD,AUDJPY,USDCAD ( Only Buy or Sell )
  2. EURUSD,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
  3. EURUSD,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
  4. EURUSD,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
  5. EURJPY,USDCAD,AUDJPY,USDCAD ( Only Buy or Sell )
  6. EURJPY,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
  7. EURJPY,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
  8. EURJPY,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
  9. AUDUSD,USDCAD,AUDJPY,USDCAD ( Only Buy or Sell )
  10. AUDUSD,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
  11. AUDUSD,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
  12. AUDUSD,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
  13. AUDNZD,USDCAD,AUDJPY,USDCAD ( Only Buy or Sell )
  14. AUDNZD,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
  15. AUDNZD,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
  16. AUDNZD,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )

1. You can trade 6 Negative Correlated pairs combined uniquely like
   1. EURUSD,USDCAD,AUDNZD,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
   2. EURUSD,USDCAD,AUDNZD,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
   3. EURUSD,USDCAD,AUDNZD,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
   4. EURUSD,USDCAD,AUDJPY,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
   5. EURUSD,USDCAD,AUDJPY,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
   6. EURUSD,USDCAD,AUDJPY,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )
   7. EURUSD,USDCAD,CADJPY,USDCAD,NZDCAD,AUDNZD ( Only Buy or Sell )
   8. EURUSD,USDCAD,CADJPY,USDCAD,NZDCHF,EURNZD ( Only Buy or Sell )
   9. EURUSD,USDCAD,CADJPY,USDCAD,CADJPY,USDCAD ( Only Buy or Sell )

Remember that correlation changes with time,so every week you should have a look at https://www.mataf.net/en/forex/tools/correlation