What do I do when Zhitai TiPro9000 SLC cache fills up and causes read latency spikes while loading high-res textures in MGSV?

Sneaking into enemy bases is a mood until the game hits a jarring micro-stutter. It's incredibly frustrating. I checked my storage monitors and found that once the Zhitai TiPro9000's dynamic SLC cache filled up, random read speeds plummeted from 6000MB/s to under 800MB/s. I tried enabling 'write caching flush' in Windows, but that actually made the read/write conflicts worse in this specific game, increasing the stutter frequency. I ended up installing the latest NVMe controller drivers, disabled the SSD power-saving mode, and manually pushed the queue depth to 2048. CrystalDiskMark showed 4K random reads jumping from 42-50MB/s to 65-72MB/s. I did have some brief drive detection delays at idle after the queue depth change, but switching to the 'High Performance' power plan killed that. Temps are 45-55°C thanks to the heatsink. Verified the read curves with the in-game tool, and it's solid.