You can get the programmer from anyone who sells HITEC for around $100.00. I am using 2 HS5645's on the rudder of my 30% edge. The 5645's are 168oz @ 6v. and there is no blow-back that I can detect. Knife edge loops are no problem and you can just hold the knife edge from one end of the field to the other without any change in attitude or input.

I tried to adjust the travel with the separate channels but then it seemed that the speed of the servos were not quite matched and then it would cause a higher drain.

After I matched all the servos with the programmer I can get 70 minutes with a 2000MA pack and still show 6.15 v left when checked with a 1000MA load. There is also NO buzzing or whining as is the norm with digital servos once they were programed identically.

As for mechanically matching the servos, I always do this first.

Make sure that each servo output shaft in EXACTLY the same distance from the hinge line, the control horns are exactly the same distance from centerline on each side and that the servo arm is perpendicular to the hinge line when at center. If you are using threaded control horns such as Rocket City or Sullivan etc. that the distance from the control surface to the centerline of the linkage is the same. To then match up servos without a programmer you can run the linkage in or out a turn or two to match the individual servo throw. You can get it close but I bet there will still be the "digital whine" on the servos as they work against each other throughout the sweep.