Split wrappers are usualy caused by the outside of the cigar and the inside of the cigars trying to be two diffirent sizes when thier humidity even out and the inside is winning. Rapid changes in humidity or temperature can set this off or make it worse. If it's happening to this many cigars, I'd say it's likely that a contributing construction issue exists. These may need to be slowly settled by leaving them in the tubes with loose caps for awhile. If anyone wants to do an experiment, try putting a few cigars into a plastic bag with a hygrometer and see where it settles. If the humidity is high, when you take them out of the tube the wrapper will try to shrink as it dries faster than the filler that don't get much direct air contact. I could be off on this, but food for thought, does the problem seem to happen once they are out of the tubes?