I've never had this problem before,
I'm dead on at 20 yards, but I can use the same pin for 25 but I hit high with it I can set the pin dead on at 25 but I'm low at 20 with it....

My bows set up same as last year, only thing different is I'm shooting lighter arrows. [&o]What's!!!!!!!! Up!!!!!!!!!!!!! ??????????[&o]

Hmmm. Is the arrow leaving the rest clean? Did you paper test after the arrow switch? If so, how is the tear? I'd look there first. How much lighter are the new arrows? At the distances involved I'm doubting the trajectory would change that much. You may want to reduce the spring tension on your rest, if the model allows. Look to the paper first... could just be a nock low issue.

I agree with Jollyarcher. Since you went to lighter arrows I'm assuming your diameter of your arrow changes which in turn would change the tune of your bow with the new arrows. It's likely the arrows are not coming out of the bow clean thusly giving you the high hit as you back off twenty yards. It has to be in your arrow flight because an arrow starts to drop immediately out of a bow similiar to a bullet...that's the law of gravity regardless of the upward trajectory...if your hitting higher at 25 than you are at 20 with the same pin, it's arrow flight...thus tuning.

I don't know from what you described if this is a possiblity but consider this. At longer ranges your arrow has a defined arc to it. Let's take 60 yards, when you are sighting your 60 yard pin, your arrow in flight, will cross your line of sight(from the pin, to your target) twice. On my bow, if I sight my 60 yard pin on a target at say 20 yards, i hit the target about 4 inches high because my arrow it still arcing towards it's peak elevation. Try this idea on your bow by literally, starting with that pin, set for twenty. shoot a target at 5 yards, then 10,15,20,25,30,35. Use a big enough target to prevent arrow loss, but sight that pin dead on a fixed spot on the target, for every shot. this will give you an idea of your trajectory and you will see if it is possible that your pin is giving you a "false" impact point on your trajectory arc