I am accustomed to having to clean the 510 threads on the top of my mods. My mechs, I clean out once or maybe twice a day. I just got my first reg mod (ipv4) and I'm cleaning it 3 or 4 times a day and getting a LOT more gunk out with each cleaning than I ever did on my mechs. I'm using the same tanks. Haven't rebuilt anything or changed anything. All is exactly the same, but there is an alarming amount of gunk build up. Any thoughts?