Temperature swings can crack wrappers, that's a big cause. Now if the binder and such is just too tight, or the main leaf is bunched up and you to with the draw tool, it can very well push that leaf right on through, that stinks. When a cigar is so tight that I need to actually go more than 1/2 inch preferable less to avoid cracking, I just call it a tight draw bad cigar.
65 is on the lower end of the spectrum...so if you had cold dry days and no temp control that could also be a cause. Always something to consider.
I don't use a tool. Tight cigars make me angry like the hulk. If I can't break a match stick and poke the cigar with say a little over 1/4 inch, and nothing happens, I'm saying it's a tight roll and either puff tuff, or toss the damned thing out.
I'm not saying 65 is bad...I prefer it myself, but climate control is equally as important for maintaining cigars.
Now if they are plugged and you feel that way, I suppose you could break em up and make some sort of pipe blend, piece it in with some cavendish and some latakia or burley...go nuts.
Smoke the leaves not the bands