If these are the SMOK DCT carto's, you may be experiencing the same issues I am. The last batch of carto's are not performing like the earlier batches I've had. Either they flood, or taste burn't right out of the gate, or a combo of both. Have an order for resurectors coming to me and will see if they are better.
I've tried stock punch, slot, dual slot (Which i've been using for a couple months with zero issues) and can not get a carto to work for more than a day at best. Boo.