I wouldn't worry too much about spooking fish. If fishing with poppers, your leader is going to be out of the water most of the time. If fishing stickbaits, I steer clear of a complete twisted leader, instead, attaching a 1 metre setion of single strand (FC or Nylon) connected via crimps or knots. Having said that, I know anglers using straight twisties to stickbaits and no seeing any reduction in strikes.