One specific light fixture seems to be killing my LED bulbs
Are there any signs of burning on the base of the bulb when you take them out? I wonder if the bulbs are not seating fully in the fixture (due to the shape of the bulbs and glass shades) and you are getting some arcing in the socket that eventually ruins the contacts.

Another thing to look at is to verify that your bulbs are approved for damp locations. It looks like most of the current Cree bulbs are but you seem to have an older model (?). If there is a shower in this room perhaps the moisture is working its way into the bulbs over time.

My final thought is to look at is the voltage at the sockets, if you have a multimeter. Is it considerably higher than the rest of the house? Anything over 125V is probably excessive. Or do these lights share a circuit with a refrigerator or something that might cause a voltage spike when the compressor turns off?