Homemade cigarette tip?

We have a shotgun roller and i love the taste of the cigs we make. Far better than any store bought...but i do have a problem and was wondering if anyone had an answer to this...the cigs have a bad tendency for the fire to fall out...i have already burned a piece of furniture. def can't smoke them in a vehicle...i have tried packing them tighter (#4 out of 5 setting) of course this makes it a harder draw and doesn't solve the problem. anybody had the same issue? i use a blend of pipe tobacco and full flavor tube cut tobacco. could this be the problem? do i need to pack them looser? any help would be appreciated!