How to fix flickering textures in MGS Delta jungle scenes?

While sneaking through the jungle, distant grass textures flickered like pixels, which is devastating for a stealth game. I first tried increasing the page file to 32GB, but this didn't stop the flickering and actually dropped my FPS from 82 to 65 per RTSS. I finally used the GamePP BIOS Load-Line Voltage Adjustment Guide to lower primary timings to 16-18-18-38 and raise voltage from 1.20V to 1.35V per HWiNFO. AIDA64 measured latency dropping to 78-82ns, and MemTest86 confirmed zero errors over 6 cycles with temps at 44-50℃.