If anyone has gotten rid of the silicon nipple, replaced it with a flat seal, and fluffed their wicks properly, and given it at least a full fill up/vape, and still having issues, please get at me, I want to help, PM or in here.
I swear by these things, and almost take it personally when they don't work for people. I've spent a few months tearing them apart and rebuilding them in every which way, I'd probably go back to analogs without them lol.
But the first step is to take all the measures above. I don't care for or about the nipples plugs (no offense to bad), get rid of them if you can't get them to work for you with the mods in this thread.
Its important to keep these different issues separate, as they have separate fixes:
1) I took it out of the box and 20 mins in it tastes like crap; I hate this, so I opened 3 more and had the same problem
2) I took it out of the box and taste burning silicon no matter what I do with the plug
3) I took it out of the box and get muted flavor, I've only vaped it half way empty
4) I've vaped it entirely through, fluffed the wicks, replaced/modded an appropriate seal, and STILL now I'm getting burnt hits/no flavor
Number 4 is rare, and a challenge I am happy to help you take up...