Sit tight. I just finished testing the 94747 - A direct replacement for the 746's and they rock. They've toned them down for aircraft use (these were originally set up for surface cars which is why they were so tight) and they don't jitter at all. I had the exact same experience with the 746's and communicated to them that they were unusable for the pattern market. And low and behold they listened and the 747's were born.
90oz of torque, <.09 transit time (these are the preliminary specs) and they were ROCK solid. Weight was good too at 1.6oz. Not sure when you'll see them on the market but soon I suspect.
I also tried the new 94770's which were also very solid. 150+ oz/in of torque and equally fast. Again, toned down a little to avoid the jitters on our light ailerons. Low current draw in flight from both of these servos. These are full standard size cases and weight 2.1 oz so a little heavier.
Both would be great aileron choices and the 770's would make a good single elevator servo. I believe the 770's are starting to ship now.