RES may not show up to the feeder. They are hard to feed train from what I hear. Your BG may just be slow to show. Mine have just begun to feed in the last two weeks and they have been on feed for 3? years. You may still be on the chilly side being further north and a larger pond. I don't think throwing more food will help. In fact, I would get tight and throw less until they find it then ramp up to a more filling level. Back when my pond was freshly stocked, the FHM found the feed first, then the BG about a week later. I'll bet you'll see some takers soon.
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