No, I haven't tried DIY to duplicate it, but boy I do love Blu's Vivid Vanilla. I'm thinking that flavor you are missing may be a bit of a
tobacco flavor.
Several people have said that Dark City Vapors Triple V is almost identical. I haven't tried it - seems to me it's not 100% VG available, so I couldn't. I also saw a review on one of Highbrow's vanilla's where someone said it was the exact match to Blu's VV, but I haven't gotten around to ordering it.
I just decided to keep buying Blu carto's in the Vivid Vanilla. They work on every 510 connection battery I have. Plus, I still use my Blu setup at work and when running errands. I
buy 'em 4 packs at a time, so the cost is reasonable since you do get the carto, as well.