Gobble, please take a minute to go to your profile and update it, adding you location. That way your location will show in the upper right corner anytime you post.
Welcome to ATP.
Personally, I have never had any luck rooting cuttings during the fall/winter months. I have never used a heat mat(s) or supplemental light though. In my opinion, it is not how much light or how much (artificial) heat you give the cuttings, it is the fact that they are going into dormancy. Perhaps you can fool Mother Nature with supplement light/heat. I just don't know. I do take cuttings in the early fall, just before moving in all my plumeria. I don't do it to root them though. I have to limit the size of my plumeria to bring them all inside, thus my cutting them back. My cut-off date to root cuttings is Sept. 15. Any cuttings taken after that date are still put into 100% coarse perlite, and kept dry, but they won't root over the fall/winter months. Those taken after Sept. 1, but by Sept. 15 may root. Some (perhaps most) just won't do so. I can only tell you my experiences and results.
Why don't you use a heat mat with supplemental fluorescent lighting and see if you get rooting. You can then tell us whether you were successful and add to my and other's knowledge. Someone who would know more than I about rooting during the fall and winter months is
@dutchlady1, and her name is Hetty.
