So there wasn't throat hit when you first received it and now, a week later there is strong th?
I know that if I'm really busy at work and don't grab my setup very often the first hit or two can be stronger th and then it goes back to being really smooth again after the first minute or two. I haven't had any other th issues except with one juice I love, their Carmel Wildwood. It's a smokey, nutty, carmel-y tobacco and after puffing on it for awhile the smokey and throat hit disappear. I have to change juice for a bit or guzzle some water and then it comes back again.
Maybe drop them an email or phone call, they had a feedback program which I *think* they recently started back up again but if it's an issue someone has had before, I'd bet they've heard about it and could let you know what's up.