I have the BLS 172HVs SBus2s on my stabs for the 514oz of torq @ 7.4s, and BLS175SVs on my rudders 291oz @ 7.4v. I put S9074SB on everything else at 6.0v you get 277oz. I always buy servos for the requirement and try not to over do it, it saves you money and your not wasting torque per say. My next large projects will get the BLS177s, they are the same as the 172s but have a metal case. Since I dont use the rubber grommets on my jets it will be nice to really get a tight fit and not worry about breaking the servo mounts.
The reason for futaba changing servos is not because of bad designs or problems they went from sbus to sbus2 really fast which has caused the big changes with servos. Hope this helps