Sounds like you tried to fix something that wasn't broken...or thought that there wouldn't be a significant change. I have learned something from your thread....the weight of the string makes a difference. Remember, straight arrow flight trumps any other modification or equipment variable you might want to play with. If I were you and found that changing the string ruined my shooting accuracy I would have to go back to what was working for me.... speaking for myself, at least. There's nothing wrong trying something new, but if it doesn't work then why wouldn't you go back to where you were? Good luck with your tuning. Maybe you will find a solution but at least you know your old way worked pretty good.