Some famous flakes are also 'sticky' especially if they are bought in tins rather than bulk, and even then Sam Gawith's wonderful 'Full Virginia' and 'Best Brown' flakes have this property to varying degrees, probably as a result of natural sugars which come out in the curing process.
These tobaccos are rightly lauded by many experienced pipers, who nevertheless complain about their preparation difficulties. The method I use completely avoids these 'problems'. I suggest not drying out the flakes themselves, but rubbing them out as if for smoking. It is not an easy rub - too much finger/thumb pressure often results in clumps of tobacco sticking together. So, with patience rub out then 'fluff up' the pile and leave on the preparation board until the perceived moisture has almost dissipated and the pile fluffs up easily. Depending on the batch, and in my experience the bulk versions are always easier, this is usually about an hour, but it may take two or even three.
Then you are ready to go!! Well worth it for one of the best smokes known to humankind!!!!