My ASUS TUF B760M-PLUS WIFI D4 is overheating and tanking CPU clocks in RDR2 with 4K mods. Help?

My ride through the heartlands was smooth for about thirty minutes, then suddenly it turned into a slideshow, especially when entering Saint Denis. I dug into the logs and found the VRMs on my ASUS TUF B760M-PLUS WIFI D4 were hitting 102-108℃ under the 4K MOD load, triggering a massive thermal throttle that tanked my CPU from 5.2GHz down to 3.1GHz. I tried cranking the BIOS fans to max, but since the heatsinks are so small, the core was still hovering around 95℃—totally useless. I had to get aggressive and manually cap the PL1 power limit to 125W and shifted the VRM fan curve to kick in at 50℃. In CPU-Z stress tests, the clock fluctuation shrunk from 1.2GHz to just 0.1GHz, keeping me steady at 60-65 FPS. I did lose about 5% single-core punch initially, but I clawed that back by setting a -0.05V voltage offset. VRMs now stay between 82-88℃. The frequency charts confirm the throttling is gone.