I'm working on a pattern-style Widebody 60/90 and am starting to wonder if I'm overdoing it on the servos. What's a good rule of thumb for pattern and aerobatics? I'm sure more speed and torque doesn't hurt, but at what's the inflection point of diminishing returns? In past aerobatic planes, I've generally followed the high side of the design recommendations, but this is my first truly pattern-style aerobatic ship.

For background, the plane will probably be around 7lbs, YS FZ91 for power and per design have one servo per aileron, one servo driving both elevator halves and one servo for the rudder. I am currently planning the following, believing in the "more is better" axiom:

Ailerons: JR 9411 digital each (82 in-oz, 0.15s)
Elevator: JR 8417 digital (82 in-oz, 0.10s)
Rudder: Futaba 9402 analog (89 in-oz, 0.09s)

These are all 4.8V ratings, but I will be using a 6V pack (can't seem to find any 6V ratings documented for JR servos).

I also have some JR 8231 digitals (88 in-oz, 0.22s) at my disposal, but was thinking they might be "too slow". However, how fast does an aileron servo really have to be since they are usually very effective?

OK, I'm sure there will be a temptation to say "if you have to ask, you don't need them". However, I'm more interested in the why's of relative speed and torque on each control surface. Rudders need lots of torque for knife edge, etc., but what's important for elevators and ailerons?