I could be wrong about this, but here are my thoughts. Maybe I'm right, or on the right track.
One quality of a couple of Dr Colorchip's paints I myself have bought and used are a seeming propensity of looking a good bit on the "flat-dull" side.
Meaning there is little to none in the way of clear pigment being added into the paint formulas. Your comments about noting that the paint looks better when still wet or wetted with the Sealact Solution seems to confirm this.
My guess is that the Dr. Colorchip Paint Formulas need to largely consist of color pigment, otherwise they'd have no ability to hide a chip and the underlying primer, that you'd still be seeing such primer even when after a numerous number of coats have been applied to fill.
Perhaps somebody, perhaps a company representative from Dr. CC can elaborate on this some more, and that my guess again would be that once a sealant, or a wax, or a coating is applied, this dullish look is then lessened, and will give the touch up repair some more gloss.
When I first used the Dr Colorchip System a few years back on my White Tahoe, about a good week after doing the chip repair I did polish the vehicle, came back again to do some minor finessing of possibly removing some of the paint during the polishing processes, and did many of them again, then I prepped and coated the entire vehicle with Carpro CQuartz UK.
I'm of the thought that the coating helped lay down a top coating of a good amount of gloss to these touched up areas, and helping them blend and match the factory finish much better.