If you see burr comb now, then look into those frames that are drawn out and see if they are packed with the syrup you are feeding..
I was told two things..
If your bees are drawing foundation FEED!
If your bees are TAKING syrup then Keep feeding!
This information is NOT correct. At least, as I applied it. I put feeders on, and kept feeding, and they kept sucking the syrup down.. I wondered why I had so little brood, and came to find out that as soon as they finished drawing out a cell they filled it with syrup. They had no place to put pollen, and the queen had no place to lay.
I pulled the feeders, because we HAD a great flow going on, and a few weeks later my hives began to grow (finally)
Wizened beekeepers explained to me that if theres a flow, there is no need to feed, EVEN if they are drawing comb.. Feeding is to help bees that have nothing to eat or to medicate. To help them get a good start, or to help them prepare for winter.
Hope that helps!