Does overcharge actually cause initial 75 regression or initial 175 regression?

I keep seeing comments that using overcharge is bad for the killer if they tap the gen before 12 seconds to get to 100, but I see others say it starts at 75 on top of the standard regression rate of 100 for a starting value of 175, and somehow overcharge + call of brine = 300%

Doss overcharge actually hurt the killer if the gen is tapped before 12 seconds, or is it additive to the base regression?

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