It's very normal for them to be chasing each other around. Aslo fur pulling is normal. You just have to make clear they don't over-stress and they don't get hurt. Then they should be parted for a sec.
If you interfear to soon, the tensions could get higher between them and the next time it could excalate.
You say they associate you with food. Do you always bring food when you enter the room? If so, maybe you could enter the room more often without the food.