I am sighting in my bow to go hunting this weekend and was wondering when my group is good enough to know if im dialed in or not. at 20 im putting 3 arrows within a 2" group at 30 i still have that 2" group but when im shooting 40 yards it widens to about 3.5 " is this good to go or should I spend more time on 40 yard shots? If this is good I have 2 more pins to get dialed in so would groups get wider or what?