the stock turbo power limits [...] are 253W, not the 4,000+ my MB's Bios settings default to.

The comma makes me think you didn't add an extra zero by mistake... What in the actual fuck? I admittedly haven't messed with any CPU clocks since like 2014, but an increase of nearly 16x over stock feels like absolutely bonkers nonsense. Like that just seems so out of spec that your computer should just catch fire. Like the hardware shouldn't even allow it.