Just to address the other part of your question RangerLee, re dilution rates.
The claim is often made that to stimulate brood rather than feed stores to the hive, diluted syrup is best. In my own hives best I can tell, stimulation of brood production is related to the actual proportion of sugar fed, rather than how diluted it is. And the other factor being over what time period it is fed.
So going into winter, you want to be aware how much water you are putting into a hive, in my view a concentrated mix is best.
If wanting to feed a hive to build stores but not stimulate brood production, a quick slam dunk of a big quantity of syrup over the shortest possible time frame is best. If wanting to stimulate brood production, then spread the feeding over a longer time frame so it more resembles a flow. Bees thinking there is a flow will be more likely to produce more brood.
Re pollen, agree with the other posters, it is equally necessary. I didn't address that cos it's not what you asked about. But one thing you should know, if your hive has enough pollen stores and to spare, adding sub at this time of year will not increase brood production. But simulating a nectar flow will.