The Culprit is a great upshot and approach disc. It can handle any arm speed and holds up well in a headwind. It has a very low profile and small diameter, making it perfect for players with smaller hands who want some beef on their approaches. We suspect you will realize the Culprit is responsible for your improved scores.
Lucid-X is a slightly stiffer plastic that results in more overstable flights compared to regular Lucid.