I haven't tried anything from this company yet, but I have this in my cart: https://scentedexpressionssupplies.com/Hogsmeade-Butterbeer-HARRY-POTTER-Type-Fragrance-SES-EXCLUSIVE-p246294084
I recommend all of these:
BB Tobacco & Bay Leaf, RE Green Tobacco, RE Cuban Tobacco, FC, Suede & Tabac, Candies & Supplies Tobacco Vanille or BA Tobacco Vanilla, WSP Tabac & Leather, FC Pipe Tobacco, WSP Tobacco Leaf & Amber
Try Bourbon Butterscotch from Nature's Fragrance. I haven't tried the ones you mentioned, but I have the one I mentioned and have used it in a warmer. It reminded me of Butterbeer.
Just finding a bittersweet cocoa has been an issue for me. I've tried every chocolate I could find and nothing has been like bittersweet chocolate. Everything smells like cupcakes or fudge, and Cocoa Woods doesn't smell like either. Theirry Mugler's Angel has a distinct dark chocolate note, too, and I don't know how they did it.
I haven't had much time to dedicate to it. Whatever alcohol you're getting should die down shortly after spraying, allowing the scent to remain. Since WSP's IFRA says you can go up to 45%, you can certainly double the FO, but you may also prefer to add your FOs to FCO instead of alcohol and use it as a roll-on.
Anything with dirt. Dirt and dark fruit. Dirt and roses is dark. It's hard to get darker than death, so maybe you could make something morbid-sounding. Amber and patchouli, myrrh, dragon's blood, bourbon, tobacco- mix any of those and add some dirt! 😆