start with FBS taking off 5 yards from listed yardage.
Then check it by either going to to a flat fairway like kia 1. or just monitoring play.
That's a good starting point and close to right for most 90+irons and level 50-81 balls.
if you use high spin titleitsts it will take off 1-2 more yards normally.
High winds will affect it more. so need to see more how the numbers work in 90 degree crosswinds or low wind conditions.
as i said it's a baseline to work from for your clubs and balls.