Based on what I've read on the tobacco extraction thread, 6-7 weeks doesn't seem near long enough for a cold extraction. That aside, even after it is fully extracted (however long it takes) and mixed (into whatever), it will still need to steep for several weeks.
Shortly after starting DIY I did some work for a local extraction company and they gave me a bottle of very good, very strong bourbon vanilla. I added a little to one of my mixes and......couldn't taste it. So, I added more, and more, and more. I think I ruined 4 or 5 factory PT coils before I finally gave up.
Quite some time later I read that vanilla requires a long steep time so I tried again, and waited, and tasted every week or so. At about 3 week I *started* to taste it. At about 5-6 weeks it was fully developed and very good. More of a subtle background flavor than an in your face artificial vanilla. I like the in you face vanilla too. The real is just different.
Unfortunately, I used most of that 300ml bottle for cooking before I decided to try it again in DIY. I only have about 30ml left, and that company no longer makes vanilla.
I currently have 2 different NET's steeping, that contain this vanilla, and am looking forward to vaping them......in a few more weeks.