Speedy here, Louisiana Open Carry Awareness League (LOCAL) Secretary/Treasurer and former VP. There are scattered posts of people's experience here and also on the LOCAL Forums. With Open Carry being legal here, there just isn't a whole lot to post about as most of us have very little issues when we Openly Carry our pistols.
As far as R.S. 40:1379.3 goes, it is probably technically correct that it doesn't affect Open Carried guns as it specifies Concealed guns, it would take a dang GOOD lawyer to fight it and get you off and it would cost you a ton of money. It IS worth looking into but, I can assure you that the police will see it differently.