sorry for the delay in getting back you until know but life’s other distractions have been calling loudly of late. Your problem solving answered this perfectly so congrats on that front and thanks for posting your reposting the response for others.
A decent book that you can download on feeding your bees in the Fat Bees Skinny Bees which I have posted the link to download this free below and whilst a part of it is pages of latin plant names and other geek associated guff the far majority of it is a very good read and well worth reading during a cold winter. You and your bees will certainly benefit from your new knowledge on this subject and you will then be armed with the facts to help save your bees in the future and also promote brood growth & honey gathering by your bees at other times of the year.
The download will also save you $35.00 which is the going rate for this publication as a hard copy.