I add uv to glow plastic that is used when I make ice baits or use that plastic in some way with another plastic in a larger bait, but then I put uv in ALL of my plastics.
I also don't put much stock in what baits do under a black light because we see things different than fish and fish haven't got access to any form of black light. The form of uv that fish see is way beyond our visual abilities and the enhancer just helps to pull that much more of that particular uv from existing light. In order to say yes or no to whether uv enhancer makes a glow pigment glow brighter would require some sophisticated equipment to measure the glowing properties in plastics with glow and without glow, but all containing equal amounts of uv enhancer. I'd ask the fish if I could communicate with them but since that isn't happening everything is simply speculation as to whether the fish think some plastic glows more than others.