Glad you are liking it.
I have tried the three you sent me.
The Halav U'Dvash is a very tasty, mellow and slightly heavy smoke. You get a little perique in the profile, and the topping is almost a burnt sugar. I noticed the orientals in the last third of the bowl. It works quite well, and I am finding I enjoy it. This is very subtle and a good combination for me.
The Natural Dutch Cavendish is a good smoke, but it is nothing fancy. I get tobacco flavor, natural subdued sweetness and a cool burn. It is a combination that works. It is not a flavor bomb or have much complexity. There is a lot to be said for a tobacco like this.
The Turkish Export was very interesting. It tickles the nose early in the bowl and gives an occasional tingle to the tongue later as you smoke the bowl down. It leaves a very pleasant sweetish aftertaste in the mouth when you are done smoking. In terms of flavor, it is thin but pleasant mix of sweet and spicy. There is no topping that I can detect. This is a mild smoke and has a decent tobacco flavor with a little something extra.
I am smoking American Heritage now in a Brebbia pot. Pretty tasty, but definitely a burley blend like the Morley's Best. AH might have a little more latakia and maybe less of the vitamin N. It is slightly more edgy if that makes sense, and there was always a slightly harsh edgy quality to Blue Boar that I enjoyed.