when you move your stick right, the slider is supposed to go the opposite way. That is normal. And to set your endpoints, make sure in your Tx your travel adjustment is set to 100%, go into the setting in the gyro, and you will hold your rudder right or left until you get it where it needs to go. If you can't adjust it all out, then yes, you need to slide your servo, or you need to move to an inner hole on the arm.
Glad you got the dial to work for you though. I have no clue about anything T6Config lol.