Been tinkering with this for a while now and still not quite found nirvana. Close a couple of times and if I'd had patience to really let mature, one would have been not too shabby,
Capella V1 custard and Rich Tobacco from Vapeable is the base I use, about 1:1 ratio then I add in bits and pieces like Digestive Biscuit, Strawberrry, Pie Crust, dashes of vanillas and/or creams.
I'd like to get a decent Honey at some point too as that'd be nice to smooth things out.
And, yes, be prepared to leave in the cupboard or drawer for a few weeks!!