sounds like all is working well, could be the juice also. i have a DID and most of the time it is great. but i just got a juice that is great, but it just dont work well with the set-up. maybe it is too sweet. it will work great for a few vapes then no flavor. but if i over tilt the mod i will again get a good flavor, but it is not consistant. i think the sugars in the juice sort of clog up the wick, so by over tilting the device the juice will then wick a little better. but by over tilting the device it then floods the wick. i have tried to alter the wick configurations by rolling different meshes and different tightnesses. just cant get this juice to taste good in the DID. if i put it into a cartomizer, no problems. so to me it sound like a wicking issue. if your wick is not getting totally saturated it will effect the flavor . is it just one particular flavor you are having a problem with? depending on what pg/vg ratio of the juice maybe a different mesh? for me i find the 270 mesh works good with my vg juices. i do have some 500 mesh on the way, have heard very good things on the 500mesh. cant wait to try it. now i really cant speak much on the DUD because i dont have one, and i am not sure of the dimentions, but for my DID i use 28g wire and do 4 wraps to get to about 0.08 to 1.0 ohms, really low resistances and have found that the flavor and vapor much better than a higher ohmed coil with thinner wire. so try over tilting the device for a while to see if it changes the flavor.