There are some reasons as to why a cigar turns bitter....ammonia....not enough rest...humidity is too high. Sick periods are sometimes a common culprit and if the other two reasons kick in you'll barely have half the cigar to enjoy. I've found with enough rest and a stable RH one can nub the cigar most of the time. I pretty much nub 90% most of my cigars as I don't buy them just to smoke half of it....call me crazy.