There's still time
On the metal taste front, I've only had two colds since I started vaping (coming on two years) and both times I got funky off tastes. Juices had elements I never tasted before (nor did I want) and there were a few funky aspects (metal, plastic, burnt) that were pronounced. Doctor friend suggested it was congestion causing blocked taste buds and nasal receptors, resulting in some pronounced sensations.
AAHHHHHHH... makes sense for sure. i'm very sensitive to metal and I only have 2 DTs I can use that are metal-Chalice III and byLeo. This stupid cold def made the metal VERY pronounced.
Since i swapped out the Chalice metal DT, that taste is totally gone. Same juice in the REO so it's not the juice throwing me off.