If they're drawing foundation or new comb, feeding is good. As mentioned, when they find a nectar source they'll sometimes stop taking the syrup. Sometimes they stop when you get queen problems although I've had hives where the queen has gone missing and they take the syrup like all was well.
Robbing is sometimes confused with orientation flights. My hives tend to have intense orientation flights on sunny afternoons. That's normal and you needn't address it at all short of just enjoying the bees. Robbing often includes wrestling and fighting at the entrance. Reducing the entrance, adding a robber screen or other methods can help reduce robbing. At some point, robbing can cause serious problems in the hive. If you have one hive robbing the other(s), sometimes taking the top off the hive that is the source of the robbers will change their mind and they'll spend time defending their colony instead of robbing others. I'd watch carefully and be sure that it's not simply orientation flights before addressing robbing concerns.
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