So I thought I'd start out with some pre fab coils for my RTA. Coil Master makes a pack with like 8 different types of coils. But when I opened it, I see the ends of the coils are REALLY long. SOme have copper covering the ends, some have thicker ends, etc, etc. I wanted to try out the various types of wire and THOUGHT this would be a good place to start but I have to cut off the ends to make them fit and it changes the ohms drastically. Were these coils made for a specific RBA? What am I missing here? THANKS!!!