I'm a beginner at vaping and currently have the Aegis Legend with pre-made coils bought from an online store. I've once tried a Pulse X by Vandy Vapes running single coil and it tasted A LOT better than mine even when using the same juice. He was using an RDA (Which I assume is the included one in the Pulse X Kit) and I am using the Pyro V3 RDTA by Vandy Vapes. Am I doing something wrong?