I have brewed this beer a couple I times.... The grain bill is right on, and use Safale S-04. I primary this beer for 3 weeks and secondary for another three, but I only use 1oz of French medium roast oak chips and two split and scraped vanilla beans. I usually only leave the oak in the beer for 7-10 days, leave the vanilla in the duration of secondary. I don't add any bourbon until I bottle or keg, I use a a little less than a 350ml bottle of makers mark. Keg or bottle age this beer another 8 weeks. I literally have a hard time telling the difference between mine and the real KBBA.