RE: eyeball help
As much as you can get without causing the servos to buzz at full throw. Then enable the dual rate function on your Tx with 50% throw for low rate.
Seriously, the secret is not trying to jerk the model around with full deflection for normal turns and flying, not limiting the amount of control throw. This model is NOT a trainer. If more training is needed, look elsewhere for a while, then get back to the Eyeball.
Best of luck to you.
Happy Holidays.
Ed Cregger