I shoot right at 300 and I have been using the two pin method for about 4 years now because of the exact same reason you are having. I set my top pin at about 23-25 yards. this cover me all the way to 30 yards. if it is a close shot i just put the pin right in the armpit and it done. If i' m at 20yds I a little high and 30 a little low, maybe a 4" difference between the two. It' s all dead no matter where you aim in the vitals.

set you top pin for ~25 yards a your second for 40yds. shoot and finds out where they group and pratice.