IMO 3" groups consistently at 25-30yds is plenty fine, as long as your broadheads shoot the same. Many folks can shoot 3" groups all day long with fp's, then they throw on the bh's and wala...6"-9" groups. So they immediately throw on the mechanicals and away they go...

Make sure your bow is properly tuned, and get those bh's shooting 3" groups and you will probably be better than 50% of the folks out there. Good luck