1 week steep: Gave a sample to my friend who I was cloning this for. We both agree it's virtually 1:1 spot-on. I wouldn't change a thing. Unbelievably true to the original.
Now, this is the short, 1 week result. If it stays true up to and beyond 30 days, I'll say it's finished. In the mean-time, just make enough for a few days, steep 7 days and I think you'll be happy with it. It does feel stable, but only time can tell.
These are all PG-FREE ingredients. If you want, you can just omit any added PG and go PG-free! Dilute the VG if that's your thing. I prefer not to dilute.