There's also another possibility. Vapers tongue. For real. It happens to all vapers where you reach a point all your juices have no flavor and it's not the equipment it's you. In particular your taste buds. Between the abuses they took from smoking, combined with new flavors being thrown at them with
vaping, it can reach a point that tasting some flavors isn't possible.
Ways to know that are it happens with any or the most common flavors you vape and it's across all your vape gear. There are many suggestions and cures including eating pickles (which I like but otherwise find not useful for a
vaping issue). But the best cure is time. Time for your taste buds to reset. I just keep on vaping right through an episode. I might not be getting the flavorful enjoyment but I'm getting my nic so I don't get tempted to have a smoke.
I'm not saying that's what you have, but do be open to possibilities that aren't necessarily related to the equipment and your ability to rebuild and wick what you have. If it's not a burnt hit or a flooded deck just stick with it, provide regular maintenance with cleaning and rewicking, and try not to get frustrated over the flavor variation you're getting. If you sense some sweetness and a vegetsbke/fruit you can't identify it might not just be your wicking that's the issue.