Either way (patient lead arm or downward drifting lead arm) feels good to me right now as long as I keep my kick timing correct. But I am learning toward a conclusion that the patient lead arm is the way to go for long distances.
The downward drift seems good for increasing stroke rate without tension or struggle.
It will be very interesting next week when I can get in a pool and try them both out with a pace clock and SPL comparison. I'll try to shoot some video as well if I can.