Think under-chin tanning reflector

The way I did it worked fabulously to reflect the sunlight
directly to the underside and backside of the fruits for getting as much antho coloring on the fruit as possible for the WOW-factor. Antho in the tomato's epidermis acts like human melanin pigment and responds to direct sunlight/UV by concentrating in the area to protect the interior of the fruit.
That's how the Amethyst Cream got those cute calyx/star shaped sunprint in the photo above. And this happens to all antho varieties with good shoulder antho color.
It's best to prune or otherwise open up the foliage canopy to expose the fruits to max sunlight. This is why some people say it's harder to grow the antho varieties and try to get max color in the south where the sunlight is too hot and cause fruit scalding. They have better luck growing them so the fruits mature during somewhat cooler months of the season.
--- NOPE to improving the flavor this way (if that's what you meant) ---
You can only try different varieties until you find ones that taste good to you. Everybody's tastebuds perceive flavors in different ways. As bad review as I am giving to Indigo Rose, the flavor profile might appeal to some people. But if I remember correctly, Indigo Rose had some of that nightshade bitterness in the skin that ...again very fuzzy memory here based on rumors and heresay so don't quote me on this... came from the P-20 (?) -- the secretly smuggled out experimental variety-- parent... and it didn't have the full-flavored base profile that might have compensated.