When adjusting presets i‘ve see a guys (including me) adjusting the pan/tilt offset in the fixture edit by hitting set and type any digit in. When it’s not the right digit they repeat the step until the offset is right.
How about an offset PT preset (like highlite/lowlight) that is directly linked to the edit fixture window??
Otherwise:
I tried to take my selection, made my Pan/Tilt look where all fixtures seem to be correct. Then i tried copying the column of the Pan values and pasting the values into the offset column of the fixture editor. Didn’t work unfortunately. Would be easy as well!