Speaking of age making all the difference, I suggest you need to reevaluate your 2 star review of GLP Kensington. I've been smoking a 7 year old tin of that lately and find it tremendous. A bit different than the standard Balkan, but that's also it's charm. It's a top shelf smoke to be sure (at least with the age on it).
I don't doubt it may improve with age, but I can't rate a blend based on that. I have to rate a blend based on how it is when it comes to me, or I end up writing speculative subjectivity, which I don't do. It's best to review a blend as it's tinned since that's generally how companies expect us to smoke them. If I waited for seven years, I couldn't give you an accurate account on the blender's intention. That would mislead the reader.
There's probably a number of blends I ought to revisit, but I can't buy tobacco for that reason. Nobody's got that kind of money. And I'm not currently buying tobacco. If I was, I'd buy my favorites or something new that interested me. I have very seldom bought anything just to review it. That'd take more money than I have.