Bobcat servos
Sir, Any one of your mentioned servos will work fine. 8411's on Ail., 2721 on Elev., 2721's on Rud. and 4131 for nose gear steering. Might want to check thickness 2721 for Elev., it is thin!
I used DS3301's for both Elev. and Rud. Keep the tail light! WHMC