Alright then go ahead and use the 8411s....you asked. From an economic standpoint, Im also not sure why you would use an 8411 with significantly less torque while the cost is not all that different. Its $$/oz of torque.

I have over 120 flights on SM F-15s all with 8611s and all were successful. I also believe that the 8611s are what is recommended by the manufacturer. When I ordered mine, I asked for all the recommended servos and the 8611 is what showed up.