One thing I did notice today is that the slight chemical taste I noticed before I think is coming from the bases rather than the flavours. I've got two brands of PG and VG base but I don't want to slag off a particular brand until I've done more figuring out because I'm not certain of anything at this point.
To use Memzey's term, I think it's venting which is what will hopefully be the way to deal with it. I've been venting first every day before shaking the bottle I made on Monday so hopefully, by the time I'm ready to vape it in about a weeks time, it'll be fine and give me a gorgeous vape.