Thomnas, the flavour in any blend I smoked for the first couple of years was sour and or flat for the bottom third and sometimes the second third, but that was more to do with the way I was smoking than the blends themselves. If you take the advice given here on drying, packing, lighting, sipping and using a cleaner to absorb moisture if it occurs, letting the pipe cool down before a relight etc you will find the flavour at the bottom of a bowl to be as satisfying as the flavour at the top and in the middle.
Isaac