I made the tea for 9g of this on Saturday. I used two whole vanilla beans, sliced and scraped and I still hardly tasted the vanilla. I didn't get a cinnamon stick, so I used about 1/2tbsp of ground cinnamon, 1tbsp ground ginger. I used a syringe to put 1ML in 2oz of beer, then 2ML was where I started tasting it. That meant that all of the tea went in. Still didn't taste much vanilla, but it's not carbed and I know that changes things a lot, from experience.
I also used WLP500 which has a big clove note to it, so it may be overpowering at this point. Anyways, kegged to two-5g cornies and it's on gas right now. Wanting to bottle off a 12-pack in 10 days and take with me on Christmas drive to Georgia for relatives. Probably won't be great quite yet by Christmas (15 days since spicing) but I can recommend they save most of the bottles until January.