I need to bow out as a contributor to solving the problem. In my humble opinion I "think" you are seeing a regulator problem like others stated my be a loose/coroded connnection. I would suspect the voltage sensing wiring from battery. starter to regulator.
while I would try the mods I have thought about, with out validation and monitoring they could result in damage.
I am not sure that the condition you are experaince is not damaging things now any way.
I would want to confirm that the current is truely that erratic with other meter or via sensing voltage as a concequentional effect
again, first thing would be verify the wiring to the regulator is good.
If you are using the mechanical voltage regulator as assumed, I wonder if the new produced are actually set up correct from the factory and maybe they require calibration prior to use
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