It's interesting how differently pipe tobacco and cigars behave with moisture. Or at least the perception.
For instance, I keep my cigars at 69% and find that outside of a very narrow range, I can generally expect my brand of cigars to not deliver the flavour I am accustomed to. I once left a box of cigars on my desk in Brazil and could not smoke them for nearly two weeks until I could get the humidity down. They were maybe around 75% or 80%, and that made them a complete waste to smoke, for me.
I think I'm more sensitive to it because while I don't smoke or buy a load of cigars, when I do, they are pretty expensive (for my taste) and I demand the best possible experience if I'm lighting up $30-$60 in one go.
Maybe I just pack my pipe differently, subconsciously even, if the moisture is too high or low. Maybe it's the reason for some of those truly exceptional bowls that I can't quite put my finger on for why they are so good.
I smoke a lot of GL Pease blends, which to my senses, seem a little more on the dry side compared to Sam Gawith or perhaps even Reiner's flake. And for some reason, I tend to get a more consistent satisfaction with GL Pease. I still smoke, and very much enjoy the other blends, but find them more finicky.
I think I'm going to run a small experiment with a week's supply of tobacco, and get different blends to the exact same moisture content. It won't change how I store tobacco long term, with all of the good advice about avoiding mould and not having to worry about it drying out.
I just can't understand why moisture content is absolutely essential in cigars for maximum flavour and getting subtle scents and tastes from a well made cigar, but more forgiving in a pipe. Maybe it's not...
Does anyone have a preferred moisture level in different types of tobacco (say flake/ribbon) that they've actually measured?