You can get up to 120 degrees of travel with your radio set to it's maximum D/R and EPA settings which is normal for all servos. If you program the 7XXX series servos past there default settings you can get up to 180 degrees but lose the higher resolution capability.

You should have no problem getting the desired control surface travel with the default end points. If you need more travel at the control surface then you will need to use a longer horn which is perfectly acceptable.

These servos offer the same travel as all other manufacturers so I'm not sure how you can say that it would not be sufficient on most applications.

Mike.