Your aileron horns point down, right? Most do. If so, we want to increase the pushing and shorten the pulling at the servo.

Is your one hole on the servo arm at 12 o'clock or 6?

If it's at 12, you want the rod from the left to plug into the wheel at 1:30, and the rod from the right connected at 7:30.

Yeah, they'll now reach over center, but they'll also push farther than they'll pull.