The only suggestion I usually offer is not to "mix and match" different servos. In other words, don't use a Futaba on one side of the wing (ailerons) and a Hitec, for instance, on the other. For that matter, don't even mix different models from the same manufacturer... standard bushing type with a high torque ball bearing. Keep them the same. There is some differences in resolution that make things difficult when you do that.

CGr.