Gemini wasn't completely out to lunch on precip totals. It also said this FWIW.
Pressure Drop in the Foothills: As the air from the ULL crashes over the mountains, it "stretches" the air column on the eastern side (the lee side). This creates a localized area of lower pressure near Marion and Morganton.
Increased Moisture Convergence: This mini-low acts like a vacuum. Even though the main coastal storm is trending east, this lee-side feature is pulling moisture back toward the mountains.
The "Inverted Trough": In the 12Z WN2, there is a clear "Inverted Trough" (a tail of low pressure) extending from the coast back toward the Foothills. This setup is a classic "snow-maker" for WNC because it forces the moisture to stay pinned against the mountains rather than just blowing past.
The result on the 12Z Maps:
Asheville: Instead of seeing "downsloping" (which usually dries out the air), the ULL is so strong that it’s overcoming that effect. The lee-side low is keeping the air "rising" rather than sinking, which is why your QPF actually went up in the latest run.
Marion/Morganton: You are in the "sweet spot" for this enhancement. The WN2 shows a convergence zone setting up right over McDowell County where the moisture from the coast meets the cold air spilling over the ridge. This is why Marion’s liquid total jumped to 0.95".