most maduros (especially double maduros) have thick wrappers that hold a lot of moisture-combine that w/the higher RH that most shops keep their humi at & it makes for a hard draw-try dryboxing for a few days or store 'em at a lower RH (65% ish) b4 smoking
A good portion of my stash is maduro, and this does not explain why I only have issues with CAO lines (both natural and maduro). Quite to the contrary, actually.