Were these from China?
On KR808D-1 I use Vapor4Life WOW cartos and I stock up when they have a sale. Many like the Smokeless Image Volt cartomizers (same as Bloogplanet maxxfusion cartos). And I used some 2.5 ohm L-Rider ones from Madvapes - they only have them in white right now - they are made the way I like, like the Vapor4Life ones, soft-cap, defined central air channel, slot cut across the center post, no inner seals, but put together a bit messier than the V4L ones. Worked decent.
Over the months I have found that my cartos work well longer if I only use juices with 20% or less VG and only use juices that don't leave a bunch of flavoring sediment (typically light clear juices leave less sediment though nicotine may make them darker and that's ok)