In the piedmont NC we normally feed light sugar water until late Oct or early Nov. Then we switch to 2:1. My bees last year did not like the 2:1. They ran away from home. Had to start over. I don't know that the 2:1 syrup was the problem, but if they don't take it this winter, I will find an alternative.
Try mixing in a couple of drops of vanilla extract or a crushed peppermint candy to your syrup and see how they take that. Some old-timers swear by it. I'm still a learner, but I'll take their word for it. I've mixed a little of my own honey in the syrup and the bees loved it, but don't ever use honey you're not absolutely certain of.