You want the truth or do you want some BS. As I understand it you sighted in a 20 yard pin, right? Then they did some kind of black magic to set a 30 and 40 yard pin, right?

Well, it doesn't happen that way in the real world. If you are using a pin sight then you have to sight in each individual pin for the yardage of your choice. Guessing where to put them doesn't get it. And for those pins to be set the right place YOU have to do all the shooting.

That's the plain and simple truth.