see trim cable install section of manual
I don't think it's in the drawings and it's not in the controls travel table in the -6/6A manual's section 15 Final Inspection and Flight Test, but the "desired" settings are in my -6/6A manual section 8 (Fuselage) under the trim cable installation section (manual trim).
I built from an older kit and manual, but here's what it says there:
"Desired down travel of the tab (nose up trim) is 35 degrees, and up travel is 25 degrees."