I'm concerned about using servo slow for and directional control. I suspect this will make your takeoffs harder. Here is what works for me (all learned here on this forum)

- I use a different channel on the same rudder stick such as the steering is completely different from the rudder
- I use 80% of expo on the steering and about 30 degrees each side
- If the plane is still unstable during the takeoff roll, I use a cheap gyro with about 50% gain. That works very well
- Optionally, setup a mix to disable the steering once the gear is retracted. You can also force the steering to be straight before the retraction occurs.
- One last other optional great thing is to setup a mix to give as much throw as available when full left or full right is given. So the throw is still exponential with about 30 degree each way but once the stick reaches its maximum position, all the available throw is used in one big step. This is great for tight maneuvers and doesn't cause any problem during takeoffs and landings.

Arnaud