Problem keeping cigars lit

Hey guys, newb over here

Anyway, I've been smoking cigars occasionally for a few years now and I seem to have a consistent problem no matter the brand. Once I get around 2/3 of the cigar left I have a really hard time keeping the thing lit. I've paid a lot of attention to the "tips" and "techniques" for smoking and think I'm doing it right. I don't ash unless I have to and I'm careful on my draws to keep the tobacco from getting too hot. I store my cigars in a desktop humidor with one of those gel-bead humidification thingies and my hygrometer usually reads somewhere in the 70's.

There's gotta be something else I'm doing wrong here. Any ideas?