I use Smoktech Pro DCT
tanks on my Silver Bullet and BB. I was gonna try some XL Boge's in place of the Smoktech DCT, but with all the quality control issues going on with Boge right now I thought better of it. I've not been totally satisfied with punching my own cartos, so looked for single coil XL that had options for pre-punched cartos. I went directly to the manufacturer:
Single Coil XL Tank Cartomizer for the SmokTank XL
I switched out around 5 tanks that had dual coil cartos to the new single coil. I got one and two holed cartos, all 2.0 resistance. Used the one hole with thin or normal juices, and the two hole for thicker juices. Working out very nice thus far. The single coils should be friendlier to battery life. I've not noted any difference in vapor production, throat hit, or flavor in the tanks that I made the switch. In fact, they seem to be working better than the dual coils in general. Happy I made the switch.