I've had a 510 Bolt for a while now, and have been using plain old standard Boge cartos the entire time. Well, this last order of Boge cartos wasn't so great, so I'm thinking about trying out something else. The website I order my juices from sells cartos, so I'm buying from them to save on shipping. The other brand they carry is SmokTech, but SmokTech has so many options! There are Mega, XL, XXXL, single coil, dual coil... I'm a little lost here! What's the difference and should they all fit my Bolt correctly?