A few thoughts...
I have an F-16 that has maybe +- 35-38 degrees of travel.

Use a relatively long moment arm on the servo and surface to minimise the affects of slop

Use a high ATV to make your servo work through a long angular range... maybe 125%

A tube makes a good pivot as it is stiffer in bending and twisting than a solid rod per unit weight. 5/16" diameter steel is a good starting point depending on the size and weight of the model.

Close fitting bushings are OK... ball bearings are better.

Stiffeness of all mountings and linkages is key.

opintions may vary, but 25% MAC is a good place to start, and static balancing is a plus....

David