Main Image Defaulting to Lowest Performing Variant

One of our products currently comes in two colors – grey and floral. Our grey color is setup as the main variant and outsells the floral variant by about 4 to 1. But, when searching for our product, the image for the floral variant is always the result that shows-up, despite the grey being setup as our primary image.

We opened a case with Amazon and they said there was nothing we can do to fix it because floral is the winning variant: “Currently the image “floral” showing is coming from winning ASIN of the variation family. Currently the winning ASIN is B0CS1YVJTQ and the image that is showing is coming from this winning ASIN. Please be informed that the ASIN which is more searched by customers become the winning ASIN.”

Does anyone know a way to resolve?