Blowing voltage regulators

I am running a dual field alternator, the VR is a mechanical original style one I just never even thought about installing the electrical one as this should work as good. I really don't care for if it looks original or not, this car won't be an concours restoration anyways, I just want it to run properly. These problems actually started to occur when I switched from a single to dual field alternator.

@Mattax the battery is new, bought it in may. And should be of good quality, it's a Bosch.
I was thinking if the VR could be adjusted, I saw in the links provided that can bee done. Or should I just leave it alone?