Overcharging problems

Hey it’s the stupid kid again. I have been fighting with my duster for about a year now I’ve always had problems with the voltage bouncing between 14 and 15 V at idle and in drive. It had the same problem when I had a 60 amp alternator in it and then I had stalling problems because I put an electric fan in it so I put a 95 amp in it nothing changed and it still sits a 15 V I’ve probably put about six regulators in it. I have a Mopar performance in it. It was perfect for about two weeks and this week it started bouncing again. I’ve checked all my grounds. I don’t know what to do at this point please help.