I agree with taking a whip or something out with you. Since you have snow, bring the hay out on a sled. Don't put any hay out until all horses stand back and wait. They can be nutty or dominant away from you and the hay you have.
Put out one or two extra piles. I would try to separate the piles a little more, maybe try 20'. It's only an extra 5 feet but might be enough.
After a few times of bring the whip out, you may not need to bring it out every time. Just on occasion as a reminder if they start to forget.
We feed round bales but I've been almost run over a couple times. The lead horse decided that they wanted a spot near where I was but another horse was in the way. I chased the lead horse away and will do it again if needed. Now when I'm out there, they don't jostle around but do if I'm not out there.
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